Add contributing documentation

Author: tim-schilling

docs/contributing.md

@@ -0,0 +1,50 @@
+# Contributing
+
+Everyone is welcome to contribute to `django-commons-playground`. We strictly
+enforce our [Code of Conduct](../CODE_OF_CONDUCT.md), so please review it before
+contributing.
+
+## Getting started
+
+1. [Fork the repository](https://github.com/django-commons/django-commons-playground/fork)
+2. Clone your fork of the repository `git clone [email protected]:[YOUR_USERNAME_HERE]/django-commons-playground.git && cd django-commons-playground`
+3. Create a venv and activate it `python -m venv venv && source venv/bin/activate`
+4. Create a feature branch for your work `git checkout -b relevant-branch-name-here`
+5. Implement your changes, run the tests and make a commit to your branch
+6. Push your branch to GitHub `git push origin relevant-branch-name-here`
+7. Create a [PR on the upstream repo (this repo)](https://github.com/django-commons/django-commons-playground/pulls)
+
+## Architecture
+
+The django-commons-playground is a collection of utility functions with a
+playground theme. The purpose is to serve as an example to inbound repositories.
+Because of that the documentation, pre-commit configuration and GitHub actions
+are the most important aspects of the project. The code itself is secondary.
+
+## Running the tests
+
+```shell
+python3 -m unittest
+```
+
+Nothing special here!
+
+## Releasing
+
+The repo is configured to [automatically release to PyPI](https://github.com/django-commons/django-commons-playground/blob/main/.github/workflows/release.yml)
+when a new tag is pushed to GitHub. This makes use of [PyPI's trusted publishers](https://docs.pypi.org/trusted-publishers/).
+
+### Manual releases
+
+In the case a manual release is necessary, you'll need to use [Twine](https://github.com/pypa/twine) and [Build](https://github.com/pypa/build).
+
+```shell
+# Install packaging dependencies
+python3 -m pip install -U twine build
+# Build the project
+python3 -m build
+# Release to test PyPI
+python3 -m twine upload --repository testpypi dist/*
+# Release to PyPI
+python3 -m twine upload dist/*
+```