Added CONTRIBUTING.md

Author: LinkedIn-Learning-A1

CONTRIBUTING.md

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+Contribution Agreement
+======================
+
+This repository does not accept pull requests (PRs). All pull requests will be closed.
+
+However, if any contributions (through pull requests, issues, feedback or otherwise) are provided, as a contributor, you represent that the code you submit is your original work or that of your employer (in which case you represent you have the right to bind your employer). By submitting code (or otherwise providing feedback), you (and, if applicable, your employer) are licensing the submitted code (and/or feedback) to LinkedIn and the open source community subject to the BSD 2-Clause license.