docs: contributing.md

CONTRIBUTING.md

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+# Contributing
+
+Before contributing please review our [code of conduct](https://github.com/TristanSMP/gateway/blob/main/CODE_OF_CONDUCT.md).
+
+## Setting up a dev environment
+
+### Prerequisites
+
+- Node 16+
+- Yarn classic (v1)
+- MySQL database
+- JDK/Java 17
+- Discord dev OAuth app
+
+If you need to modify wings, you should download it [here](https://github.com/TristanSMP/wings/releases).  
+If there's nothing there, you can download the dev version from [here](https://cdn.tristancamejo.com/tsmp/wings-all.jar).
+
+### Clone the Git repo
+
+```sh
+git clone https://github.com/TristanSMP/gateway.git
+```
+
+### Environment variables
+
+Fill in your environment variables according to the [`.env.example`](https://github.com/TristanSMP/gateway/blob/main/.env.example).
+
+The `ELYTRA_API_ROOT` environment variable should **not** including a trailing slash.
+
+### Installing dependencies
+
+Make sure you're in the project root, and run:
+
+```sh
+yarn
+```
+
+### Running the Next.js app
+
+If you haven't already, this is the time to start your MySQL server.
+Create a MySQL database user called "tsmp" and grant it all permissions.
+
+```sh
+# Push prisma schema to database
+# Only needed when schema.prisma is updated or in a new database
+yarn prisma db push
+
+yarn dev
+```
+
+If everything goes smoothly, you should see the homepage at http://localhost:3000.
+Don't worry if you got some errors as you have not configured Wings or the Discord app yet.
+
+If you get a build-time error on the homepage or unable to get it working,
+you can visit the #developing-tsmp channel in our [Discord server](https://tristansmp.com/discord).
+
+### Running Wings
+
+WIP
+
+### Configuring Discord app
+
+WIP