Update CONTRIBUTING.md

CONTRIBUTING.md

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 ## Before You Start
 
-Anyone wishing to contribute to the UI for Universal Windows Platform project MUST read & sign the [UI For Universal Windows Platform Contribution License Agreement](https://docs.google.com/forms/d/e/1FAIpQLScXkQkYKKZZKXV9aTkhvCT3Q1cACosyhKUILPdOl7Ly9PIL_g/viewform). The UI for UWP team cannot accept pull requests from users who have not signed the CLA first.
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 This project has adopted the code of conduct defined by the Contributor Covenant to clarify expected behavior in our community.
 For more information see the [.NET Foundation Code of Conduct](https://dotnetfoundation.org/code-of-conduct).