Add more contribution help

CONTRIBUTING.md

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+# Contributing to Lysand
+Thank you for your interest in contributing to Lysand! We welcome contributions from everyone, regardless of their level of experience or expertise.
+
+## Getting Started
+To get started, please follow these steps:
+
+1. Fork the repository, clone it on your local system and make your own branch
+2. Install the [Bun](https://bun.sh) runtime:
+```sh
+curl -fsSL https://bun.sh/install | bash
+```
+3. Run `bun install` in the project directory to install the dependencies
+```sh
+bun install
+```
+> You will need a running PostgreSQL database for the next step
+
+> If you don't have a running PostgreSQL instance, you can use the following `docker-compose.yml` file to start one:
+> ```yaml
+>services:
+>  db:
+>    image: postgres:13-alpine
+>    restart: always
+>    init: true
+>    environment: {
+>      POSTGRES_USER: fediproject,
+>      POSTGRES_PASSWORD: fediproject,
+>      POSTGRES_DB: fediproject
+>    }
+>    ports:
+>      - 5432:5432
+>    volumes:
+>      - ./data:/var/lib/postgresql/data
+> ```
+
+4. Copy the `config/config.example.toml` file to `config/config.toml` and change the database connection values to your own Postgres instance
+> For the example above, the values would be:
+> ```toml
+> [database]
+> host = "localhost"
+> port = 5432
+> username = "fediproject"
+> password = "fediproject"
+> database = "fediproject"
+> ```
+5. Fill in the rest of the config file with your own configuration (you can leave most things to the default)
+
+## Testing your changes
+
+To start the live server on the address and port specified on the config file, run:
+```sh
+bun dev
+```
+
+If your port number is lower than 1024, you may need to run the command as root.
+
+## Running tests
+
+To run the tests, run:
+```sh
+bun test
+```
+
+The tests are located in the `tests/` directory and follow a Jest-like syntax.