Add section Documentation to CONTRIBUTING.md

docs/CONTRIBUTING.md

@@ -1,10 +1,42 @@
-# Python code style
+# Contributing
 
-## black
+## Python code style
+
+### black
 
 We use [black](https://black.readthedocs.io/en/stable/) code formatter.
 
 - Revision: `20.8b1` or branch `stable`.
 - See configuration in `pyproject.toml`.
 
 Run before each commit: `black .`
+
+## Documentation
+
+### Generating documentation
+
+Install Sphinx and plugins:
+```bash
+pip install sphinx autodoc recommonmark sphinx-rtd-theme
+```
+
+Generate HTML:
+```bash
+cd docs
+make html
+```
+
+Generated documentation will be in `docs/_build/html`.
+
+### Uploading to GitHub Pages
+
+Documentation for GitHub Pages is placed in following branch
+[`gh-pages`](https://github.com/IntelPython/numba-dppy/tree/gh-pages).
+
+Folders:
+- `dev` folder contains current documentation for default branch.
+- `0.12.0` folder and other similar folders contain documentation for releases.
+- `latest` folder is a link to the latest release folder.
+
+Copy generated documentation into corresponding folder and create pull request
+to `gh-pages` branch.