docs(appium): Add contributing documentation (#18691)

.vscode/extensions.json

@@ -0,0 +1,5 @@
+{
+  "recommendations": [
+    "stateful.runme"
+  ]
+}

packages/appium/docs/en/contributing/index.md

@@ -1,5 +1,6 @@
 ---
 title: Contributing to Appium
+cwd: ../../../../../
 ---
 
 This section of Appium's documentation is for those who are interested in contributing to Appium's
@@ -16,8 +17,105 @@ already.
 
 ## Ways to Contribute
 
-TODO
+The project offers a variety of ways to contribute, e.g.:
+
+- contributing code
+- improving documentation
+- creating educational content (blog posts, tutorials, videos, etc.)
+- spreading the good word about the project (e.g. via Twitter)
+- filing bugs if you discover them while using Appium
+- making feature requests if you are missing something in the project or help triaging bugs
+- supporting users in the [Appium forum](https://discuss.appium.io/)
 
 ## The Appium Development Process
 
-TODO
+To contribute to the Appium code base make sure to check out the Git repository.
+
+!!! info
+
+    If you are VS Code user you can easily check out the project using [Runme](https://runme.dev/api/runme?repository=https%3A%2F%2Fgithub.com%2Fappium%2Fappium.git&fileToOpen=packages%2Fappium%2Fdocs%2Fen%2Fcontributing%2Findex.md).
+
+It is advised to [fork](https://github.com/appium/appium/fork) before cloning it to your system.
+
+```sh { name=clone }
+export GITHUB_USERNAME=<your-username>
+git clone git@github.com:$GITHUB_USERNAME/appium.git
+```
+
+After cloning you can go ahead and install the project dependencies:
+
+```sh { name=install }
+npm install
+```
+
+From here on there are several things you can do.
+
+### Watch Files
+
+When developing Appium code we have to watch all JavaScript and TypeScript files to re-compile them after every change. You can run this watch process via:
+
+```sh { name=watch, background=true }
+npm run dev
+```
+
+### Start Appium in Dev-Mode
+
+To test your changes you can run Appium in dev mode via:
+
+```sh { name=start }
+npm start
+```
+
+### Run Tests
+
+The project maintains a set of different test variations you can run to verify the quality of the code.
+
+#### Linting
+
+Appium uses EsLint for static code analysis and linting. You can run these checks via:
+
+```sh { name=test-linting }
+npm run lint
+```
+
+#### Unit
+
+Run via:
+
+```sh { name=test-unit }
+npm run test:unit
+```
+
+You can also run tests for specific workspaces, e.g.:
+
+```sh { name=test-workspace }
+export APPIUM_WORKSPACE=@appium/doctor
+npm run test:unit -w $APPIUM_WORKSPACE
+```
+
+#### Smoke and e2e Tests
+
+Run via:
+
+```sh { name=test-slow }
+npm run test:slow
+```
+
+### Deploy Docs Locally
+
+Our documentation system uses [MKDocs](https://www.mkdocs.org/) and therefor requires [Python](https://www.python.org/) to be installed on your system. You can run the docs by:
+
+```sh
+# installing needed Python dependencies
+pip install -r packages/docutils/requirements.txt
+# build the project
+npm run build
+# run dev server
+npm run dev:docs
+```
+
+You should be able to view the page at `http://127.0.0.1:8000/docs/en`:
+
+```sh
+open http://127.0.0.1:8000/docs/en
+```