META | Add separate contribution guidelines file

CONTRIBUTING.md

@@ -0,0 +1,20 @@
+### DietPi Project Contribution.
+
+Coders (Git):
+Please use the active development branch "testing": https://github.com/Fourdee/DietPi/tree/testing
+* Adding new software installation options to DietPi-Software: https://github.com/Fourdee/DietPi/issues/490#issuecomment-244416570
+
+Are you able to:
+* Provide feedback and/or test areas of DietPi, to improve the user experience.
+* Report bugs.
+* Improve/Add more features to the DietPi website (dietpi.com).
+* Compile software for Odroid C1 and RPi systems.
+* Contribute to DietPi with programming on git hub.
+* Suggest new software that we can add to the dietpi-software install system.
+
+If so, let us know!
+We are always looking for talented people who believe in the DietPi project, and, wish to contribute in any way you can.
+
+* Send me an Email: [email protected]
+* Join our forums: https://dietpi.com/phpbb
+* Git Hub: https://github.com/Fourdee/DietPi