Create CONTRIBUTING.md

[MarioDevTM]

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[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
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[iparaskev]

@MarioDevTM thanks for the PR. We already have a page with contribution guidelines here. Instead of duplicating info we can just link to our doc's page in CONTRIBUTING.md