Move CONTRIBUTING.md into the docs folder

Author: Earthcomputer

README.md

@@ -17,26 +17,4 @@ Patreon: https://www.patreon.com/earthcomputer
    and move it to the mods folder (`.minecraft/mods`).
 
 ## Contributing
-1. Clone the repository
-   ```
-   git clone https://github.com/Earthcomputer/clientcommands
-   cd clientcommands
-   ```
-1. Generate the Minecraft source code
-   ```
-   ./gradlew genSources
-   ```
-   - Note: on Windows, use `gradlew` rather than `./gradlew`.
-1. Import the project into your preferred IDE.
-   1. If you use IntelliJ (the preferred option), you can simply import the project as a Gradle project.
-   1. If you use Eclipse, you need to `./gradlew eclipse` before importing the project as an Eclipse project.
-1. Edit the code
-1. After testing in the IDE, build a JAR to test whether it works outside the IDE too
-   ```
-   ./gradlew build
-   ```
-   The mod JAR may be found in the `build/libs` directory
-1. [Create a pull request](https://help.github.com/en/articles/creating-a-pull-request)
-   so that your changes can be integrated into clientcommands
-   - Note: for large contributions, create an issue before doing all that
-     work, to ask whether your pull request is likely to be accepted
+See the [contribution guidelines](docs/CONTRIBUTING.md)