doc: update CONTRIBUTING.md

Signed-off-by: Kevin Morris <kevr@0cost.org>

CONTRIBUTING.md

@@ -9,7 +9,7 @@ You can add a git hook to do this by installing `python-pre-commit` and running
 `pre-commit install`.
 
 [1]: https://lists.archlinux.org/listinfo/aur-dev
-[2]: https://gitlab.archlinunx.org/archlinux/aurweb
+[2]: https://gitlab.archlinux.org/archlinux/aurweb
 
 ### Coding Guidelines
 
@@ -23,6 +23,76 @@ development.
 3. Use four space indentation
 4. Use [conventional commits](https://www.conventionalcommits.org/en/v1.0.0/)
 5. DRY: Don't Repeat Yourself
-6. All code should be tested for good _and_ bad cases
+6. All code should be tested for good _and_ bad cases (see [test/README.md][3])
+
+[3]: https://gitlab.archlinux.org/archlinux/aurweb/-/blob/master/test/README.md
 
 Test patches that increase coverage in the codebase are always welcome.
+
+### Coding Style
+
+We use the `flake8` and `isort` tools to manage PEP-8 coherenace and
+import ordering in this project.
+
+There are plugins for editors or IDEs which automate this process. Some
+example plugins:
+
+- [tell-k/vim-autopep8](https://github.com/tell-k/vim-autopep8)
+- [fisadev/vim-isort](https://github.com/fisadev/vim-isort)
+- [prabirshrestha/vim-lsp](https://github.com/prabirshrestha/vim-lsp)
+
+See `setup.cfg` for flake8 and isort specific rules.
+
+Note: We are planning on switching to [psf/black](https://github.com/psf/black).
+For now, developers should ensure that flake8 and isort passes when submitting
+merge requests or patch sets.
+
+### Development Environment
+
+To get started with local development, an instance of aurweb must be
+brought up. This can be done using the following sections:
+
+- [Using Docker](#using-docker)
+- [Using INSTALL](#using-install)
+
+There are a number of services aurweb employs to run the application
+in its entirety:
+
+- ssh
+- cron jobs
+- starlette/fastapi asgi server
+
+Project structure:
+
+- `./aurweb`: `aurweb` Python package
+- `./templates`: Jinja2 templates
+- `./docker`: Docker scripts and configuration files
+
+#### Using Docker
+
+Using Docker, we can run the entire infrastructure in two steps:
+
+    # Build the aurweb:latest image
+    $ docker-compose build
+
+    # Start all services in the background
+    $ docker-compose up -d nginx
+
+`docker-compose` services will generate a locally signed root certificate
+at `./data/root_ca.crt`. Users can import this into ca-certificates or their
+browser if desired.
+
+Accessible services (on the host):
+
+- https://localhost:8444 (python via nginx)
+- https://localhost:8443 (php via nginx)
+- localhost:13306 (mariadb)
+- localhost:16379 (redis)
+
+Docker services, by default, are setup to be hot reloaded when source code
+is changed.
+
+#### Using INSTALL
+
+The [INSTALL](INSTALL) file describes steps to install the application on
+bare-metal systems.