Add 'Development' section to documentation

docs/development.rst

@@ -0,0 +1,31 @@
+===========
+Development
+===========
+
+Dropping support for deprecated Python versions
+-----------------------------------------------
+
+When a Python version is officially deprecated, it needs to be removed from the
+versions supported by this package. To do so, the following actions need to be taken:
+
+* In `setup.cfg`:
+
+  * Remove the Python version from the classifiers.
+  * Update the minimum supported Python version in `python_requires`.
+
+* In `tox.ini`:
+
+  * Remove the Python version from `tox.envlist`.
+  * Remove the Python version from `gh-actions.python`.
+
+* In `.github/workflows/test_and_publish.yml`:
+
+  * Remove the Python version from the build matrix.
+
+* In the GitHub repository settings:
+
+  * If necessary, update the required status checks in the branch protection
+    rules.
+
+The status of the Python versions can be found `here
+<https://devguide.python.org/versions/>`_.