Create SECURITY.md

Author: gaearon

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+# Reporting Security Issues
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+If you believe you have found a security vulnerability in Create React App, we encourage you to let us know right away. We will investigate all legitimate reports and do our best to quickly fix the problem.
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+Please refer to the following page for our responsible disclosure policy, reward guidelines, and those things that should not be reported:
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+https://www.facebook.com/whitehat