Add instructions for contributors (following conventions)

Author: bittner

CONTRIBUTING.rst

@@ -0,0 +1,50 @@
+Contributing
+============
+
+If you want to improve the code base, add a feature or update the
+documentation please open a `pull request`_. Feel free to `open an issue`_
+beforehand to discuss your plans.
+
+.. _pull request: https://github.com/painless-software/python-cli-test-helpers/pulls
+.. _open an issue: https://github.com/painless-software/python-cli-test-helpers/issues
+
+Development
+-----------
+
+This project uses Tox to run its test suite. Install it using Pip like this:
+
+.. code-block:: shell
+
+    python3 -m pip install tox
+
+Alternatively, if you use `uv`_, install Tox as a development tool like this:
+
+.. code-block:: shell
+
+    uv tool install tox --with tox-uv
+
+Usage:
+
+.. code-block:: shell
+
+    tox list             # list available environments
+    tox -e py            # run tests with local default Python
+    tox -e lint,format   # run a few environments
+    tox                  # run entire suite
+
+.. _uv: https://docs.astral.sh/uv/
+
+Documentation
+-------------
+
+Build the documentation locally and view it in your Web browser:
+
+.. code-block:: console
+
+    $ tox -e clean,docs
+    ...
+    $ cd docs/_build/html/
+    $ python -m http.server
+    Serving HTTP on 0.0.0.0 port 8000 (http://0.0.0.0:8000/) ...
+
+Click on the displayed link to inspect the generated documentation.

README.rst

@@ -42,6 +42,7 @@ arguments and environment variable values.
 .. _docopt: http://docopt.org/
 .. _documentation: https://python-cli-test-helpers.readthedocs.io/
 .. _CLI Copier template: https://gitlab.com/painless-software/cicd/app/cli
+.. _CONTRIBUTING: https://github.com/painless-software/python-cli-test-helpers/blob/main/CONTRIBUTING.rst
 
 .. links-marker
 
@@ -61,16 +62,4 @@ effortlessly.
 Development
 -----------
 
-This project uses Tox to run its test suite. Install and use it locally like
-this:
-
-.. code-block:: shell
-
-    python3 -m pip install tox
-
-.. code-block:: shell
-
-    tox list            # list available environments
-    tox -e lint,py312   # run a few environments
-    tox -e py           # run tests with local default Python
-    tox                 # run entire suite
+See `CONTRIBUTING`_.

docs/contributing.rst

@@ -0,0 +1 @@
+.. include:: ../CONTRIBUTING.rst

docs/index.rst

@@ -11,6 +11,7 @@ Contents
    tutorial
    other
    techniques
+   contributing
 
 Quotes
 ------