add ReadTheDocs configuration

.readthedocs.yaml

@@ -0,0 +1,19 @@
+# Read the Docs configuration file for Sphinx projects
+# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
+
+# Required
+version: 2
+
+# Set the OS, Python version and other tools you might need
+build:
+  os: ubuntu-22.04
+  tools:
+    python: "3.12"
+
+# Build documentation in the "doc_src/" directory with Sphinx
+sphinx:
+  configuration: doc_src/conf.py
+
+python:
+  install:
+    - requirements: requirements/test.txt