Add initial CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing to Panda3D
+Thank you for looking into ways to contribute to Panda3D.
+Most information on how to contribute and get involved already exists in other places.
+Therefore this page serves as another way to find those resources.
+
+## Useful Links
+* [panda3d.org](https://www.panda3d.org)
+* [Manual](https://docs.panda3d.org/1.10/python/index)
+
+### Getting in Touch With the Community
+* [Discord](https://discord.gg/UyepRMm)
+* [IRC](https://www.panda3d.org/manual/?title=The_IRC_Channel)
+* [Forum](https://discourse.panda3d.org/)
+
+
+## Building the Project
+Information on how to build Panda3D can be found in the [README](https://github.com/panda3d/panda3d#building-panda3d).
+
+## Testing the Project
+Information on how to test Panda3D can be found in the [README](https://github.com/panda3d/panda3d#running-tests).
+
+## Ways to Get Involved
+Information on various ways to get involved with Panda3D can be found [on the main web site](https://www.panda3d.org/get-involved/).