docs: add "contribute" section to new docs (#1786)

Co-authored-by: alvarius <alvarius@lattice.xyz>

next-docs/pages/_meta.js

@@ -22,6 +22,7 @@ export default {
   plugins: "Plugins",
   templates: "Templates",
   guides: "Guides",
+  contribute: "Contribute",
   changelog: "Changelog",
   retrospectives: "Retrospectives",
   // --------------------

next-docs/pages/contribute.mdx

@@ -0,0 +1,38 @@
+## Contribute
+
+We'd love your support in improving MUD! [The MUD monorepo](https://github.com/latticexyz/mud) includes all of MUD's source code, and pull requests are always welcome.
+To discuss new features or changes [join our Discord](https://lattice.xyz/discord).
+
+You can find a list of good first issues (that don't require a lot of context on the full system) at [contribute.mud.dev](https://contribute.mud.dev).
+
+### Local development setup
+
+The following steps are only necessary if you want to contribute to MUD. To use MUD in your project, [set up a new project with the MUD CLI](/quick-start).
+
+1. Ensure you have these applications installed:
+
+   | Software                                                 | Tested with version |
+   | -------------------------------------------------------- | ------------------- |
+   | [`curl`](https://curl.se/)                               | 7.74.0              |
+   | [`node`](https://nodejs.org/en/download/package-manager) | 18.17.0             |
+   | [`pnpm`](https://pnpm.io/)                               | 8.6.11              |
+   | [`Foundry`](https://getfoundry.sh/)                      | 0.2.0               |
+
+1. Download the source code for MUD.
+
+   ```sh copy
+   git clone https://github.com/latticexyz/mud.git
+   cd mud
+   ```
+
+1. Install and build packages.
+
+   ```sh copy
+   pnpm install
+   pnpm build
+   ```
+
+### Pull requests
+
+MUD follows the [conventional commit specification](https://www.conventionalcommits.org/en/v1.0.0/) for PR titles.
+Please keep the scope of your PR small (rather open multiple small PRs than one huge PR).