docs(CONTRIBUTING.md): add more info for contributors

Closes #4636
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## Submitting issues
#Contributing to AngularJS
If you have questions about how to use AngularJS, please direct these to the
[Google Group][groups] discussion list or [StackOverflow][stackoverflow]. We are
also available on [IRC][irc].
We'd love for you to contribute to our source code and to make AngularJS even better than it is
today! Here are the guidelines we'd like you to follow:
## Guidelines
## Got a Question or Problem?
If you have questions about how to use AngularJS, please direct these to the [Google Group][groups]
discussion list or [StackOverflow][stackoverflow]. We are also available on [IRC][irc].
## Found an Issue?
If you find a bug in the source code or a mistake in the documentation, you can help us by
submitting and issue to our [GitHub Repository][github]. Even better you can submit a Pull Request
with a fix.
***Localization Issue:*** *Angular.js uses the [Google Closure I18N library], to generate its own I18N files. This means that
any changes to these files would be lost the next time that we import the library. The recommended
approach is to submit a patch to the I18N project directly, instead of submitting it here.*
**Please see the Submission Guidelines below**.
## Want a Feature?
You can request a new feature by submitting an issue to our [GitHub Repository][github]. If you
would like to implement a new feature then consider what kind of change it is:
* **Major Changes** that you wish to contribute to the project should be discussed first on our
[mailing list][groups] or [IRC][irc] so that we can better coordinate our efforts, prevent
duplication of work, and help you to craft the change so that it is successfully accepted into the
project.
* **Small Changes** can be crafted and submitted to [GitHub Repository][github] as a Pull Request.
## Submission Guidelines
### Submitting an Issue
Before you submit your issue follow the following guidelines:
* Search the archive first, it's likely that your question was already answered.
* A live example demonstrating your problem or question, will get an answer faster.
* Create one using this [template][template]
* A live example demonstrating the issue, will get an answer faster.
* Create one using [Plunker][plunker] or [JSFiddle][jsfiddle].
* If you get help, help others. Good karma rulez!
If your issue appears to be a bug, and hasn't been reported, open a new issue.
Help us to maximize the effort we can spend fixing issues and adding new
features, by not reporting duplicate issues.
## Contributing to Source Code
### Submitting a Pull Request
Before you submit your pull request follow the following guidelines:
We'd love for you to contribute to our source code and to make AngularJS even
better than it is today!
* Search GitHub for an open or closed Pull Request that relates to your submission. You don't want
to duplicate effort.
* Make your changes in a new git branch
* Follow our Coding Rules
* Follow our Git Commit Guidelines
* Build your changes locally and on Travis (by pushing to GitHub) to ensure all the tests pass.
* Sign the Contributor License Agreement (CLA). We cannot accept code without this.
* If we suggest changes then you can modify your branch, rebase and force a new push to your GitHub
repository to update the Pull Request.
Please read the [contribution guidelines][contribute] to learn about how to submit code
as well as other useful info like how to build and test AngularJS code.
## Coding Rules
To ensure consistency throughout the source code, keep these rules in mind as you are working:
### Note to Localization Pull Requests
* All features or bug fixes **must be tested** by one or more [specs][unit-testing].
* All public API methods **must be documented** with ngdoc, an extended version of jsdoc (we added
support for markdown and templating via @ngdoc tag). To see how we document our APIs, please check
out the existing ngdocs and see [this wiki page][ngDocs].
* With the exceptions listed below, we follow the rules contained in
[Google's JavaScript Style Guide][js-style-guide]:
* **Do not use namespaces**: Instead, wrap the entire angular code base in an anonymous closure and
export our API explicitly rather than implicitly.
* Wrap all code at **100 characters**.
* Instead of complex inheritance hierarchies, we **prefer simple objects**. We use prototypical
inheritance only when absolutely necessary.
* We **love functions and closures** and, whenever possible, prefer them over objects.
* To write concise code that can be better minified, we **use aliases internally** that map to the
external API. See our existing code to see what we mean.
* We **don't go crazy with type annotations** for private internal APIs unless it's an internal API
that is used throughout AngularJS. The best guidance is to do what makes the most sense.
Angular.js currently uses the
[Google Closure I18N library], to generate its own I18N files. This means that any
changes to these files would be lost the next time that we import the library. The
recommended approach is to submit a patch to the I18N project directly, instead of
submitting it here.
## Git Commit Guidelines
We have very precise rules over how our git commit messages can be formatted. This leads to **more
readable messages** that are easy to follow when looking through the **project history**. But also,
we use the git commit messages to **generate the AngularJS change log**.
### Commit Message Format
Each commit message consists of a **header**, a **body** and a **footer**. The header has a special
format that includes a **type**, a **scope** and a **subject**:
```
<type>(<scope>): <subject>
<BLANK LINE>
<body>
<BLANK LINE>
<footer>
```
Any line of the commit message cannot be longer 100 characters! This allows the message to be easier
to read on github as well as in various git tools.
### Type
Must be one of the following:
* **feat**: A new feature
* **fix**: A bug fix
* **docs**: Documentation only changes
* **style**: Changes that do not affect the meaning of the code (white-space, formatting, missing
semi-colons, etc)
* **refactor**: A code change that neither fixes a bug or adds a feature
* **test**: Adding missing tests
* **chore**: Changes to the build process or auxiliary tools and libraries such as documentation
generation
### Scope
The scope could be anything specifying place of the commit change. For example `$location`,
`$browser`, `$compile`, `$rootScope`, `ngHref`, `ngClick`, `ngView`, etc...
### Subject
The subject contains succinct description of the change:
* use the imperative, present tense: "change" not "changed" nor "changes"
* don't capitalize first letter
* no dot (.) at the end
###Body
Just as in the **subject**, use the imperative, present tense: "change" not "changed" nor "changes"
The body should include the motivation for the change and contrast this with previous behavior.
###Footer
The footer should contain any information about **Breaking Changes** and is also the place to
reference GitHub issues that this commit **Closes**.
A detailed explanation can be found in this [document][commit-message-format].
## Signing the CLA
Please sign our Contributor License Agreement (CLA) before sending pull requests. For any code
changes to be accepted, the CLA must be signed. It's a quick process, we promise!
* For individuals we have a [simple click-through form][individual-cla].
* For corporations we'll need you to
[print, sign and one of scan+email, fax or mail the form][corporate-cla].
## Further Information
You can find out more detailed information about contributing in the
[AngularJS documentation][contributing].
[github]: https://github.com/angular/angular.js
[Google Closure I18N library]: https://code.google.com/p/closure-library/source/browse/closure/goog/i18n/
[list]: https://groups.google.com/forum/?fromgroups#!forum/angular
[contribute]: http://docs.angularjs.org/misc/contribute
[stackoverflow]: http://stackoverflow.com/questions/tagged/angularjs
[groups]: https://groups.google.com/forum/?fromgroups#!forum/angular
[irc]: http://webchat.freenode.net/?channels=angularjs&uio=d4
[template]: http://plnkr.co/edit/gist:3510140
[plunker]: http://plnkr.co/edit
[jsfiddle]: http://jsfiddle.net/
[ngDocs]: https://github.com/angular/angular.js/wiki/Writing-AngularJS-Documentation
[unit-testing]: http://docs.angularjs.org/guide/dev_guide.unit-testing
[js-style-guide]: http://google-styleguide.googlecode.com/svn/trunk/javascriptguide.xml
[contributing]: http://docs.angularjs.org/misc/contribute
[individual-cla]: http://code.google.com/legal/individual-cla-v1.0.html
[corporate-cla]: http://code.google.com/legal/corporate-cla-v1.0.html
[commit-message-format]: https://docs.google.com/document/d/1QrDFcIiPjSLDn3EL15IJygNPiHORgU1_OOAqWjiDU5Y/edit#