Add CONTRIBUTING.md

Author: Constellation

CONTRIBUTING.md

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+Project license(s): 2-clause BSD license
+
+* You will only Submit Contributions where You have authored 100% of the content.
+* You will only Submit Contributions to which You have the necessary rights. This means that if You are employed You have received the necessary permissions from Your employer to make the Contributions.
+* Whatever content You Contribute will be provided under the Project License(s).