Add client documentation

docs/setup/clients/index.md

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+# Clients
+
+!!! note "The Fosscord client is, at the time of writing this (March 17th, 2023), under heavy development and not ready to be used in production just yet."
+
+!!! note "Windows support is currently broken."
+
+The official Fosscord client is currently being developed at [this repository](https://github.com/fosscord/fosscord-client/tree/dev/bare-rewrite).
+
+## Dependencies
+
+- [Git](https://git-scm.com/)
+- [NodeJS](https://nodejs.org). Version 16+
+- [yarn](https://yarnpkg.com/) (preferred) or npm
+
+## Setup/Building
+
+In your terminal:
+
+```bash
+# Download Fosscord Client
+git clone https://github.com/fosscord/fosscord-client.git
+
+# Enter the cloned directory, switch branches to the one, which is actually being developed
+cd fosscord-client; git switch dev/bare-rewrite
+
+# Install dependencies
+yarn install
+```
+
+To start the client with Metro for development, run
+
+```bash
+yarn start
+```
+
+!!! note "Platform-specific development commands:"
+
+    For development for Android, run
+
+    ```bash
+    yarn android
+    ```
+
+    For development for iOS, run
+
+    ```bash
+    yarn ios
+    ```
+
+    For development for Windows, run
+
+    ```bash
+    yarn windows
+    ```
+
+To build static files for the web, run
+
+```bash
+yarn build:web
+```
+
+Files will be built to `web-build`
+
+## Contributing
+
+To contribute:
+
+- [Fork the repository](https://github.com/fosscord/fosscord-client/fork)
+- Run the building instructions.
+- Commit & Push.
+- Pull Request & Done!
+
+### What can I contribute?
+
+- "Core" features like settings, editing messages, dms, markdown rendering, etc. What do you think are basic features that you would want? Some of the GitHub Issues apply to this.
+- Implementing other things like voice/video is fine too, though
+- [This](https://github.com/fosscord/fosscord-client/issues/21) is a good starting point and lists all things that are still missing from the client.