Updated documentation

Author: cognitivegears

CONTRIBUTING.md

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+## Contributing
+
+There are several ways to contribute to the development of DriveWireServer:
+
+### Developer
+
+Pull requests are always appreciated.  See [Issues](https://github.com/DriveWire/DriveWireServer/issues) for a current list of items to work on.
+
+### Testers
+
+Given the many configurations possible with DriveWire, all testing help is appreciated. Please add any issues found to the [Issues](https://github.com/DriveWire/DriveWireServer/issues) tracker.
+
+### General
+
+Join the discussion on the CoCo mailing list: [CoCoList](https://pairlist5.pair.net/mailman/listinfo/coco) to join in the discussion!