Create SECURITY.md (#3052)

* Create SECURITY.md

A simple instruction for security researchers!

* Update SECURITY.md

* Update SECURITY.md

Co-authored-by: Kevin van Zonneveld <vanzonneveld@gmail.com>

Co-authored-by: Artur Paikin <artur@arturpaikin.com>
Co-authored-by: Kevin van Zonneveld <vanzonneveld@gmail.com>

SECURITY.md

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+# Security Policy
+
+## Reporting a Vulnerability
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+General security issues and concerns are we welcome in the public Github issue tracker: https://github.com/transloadit/uppy/issues.
+
+In case of a high risk of the shared vulnerability being exploited, please report it to support@transloadit.com instead, and visit https://transloadit.com/security/ to read about Transloadit’s security policy, and how we generally handle these cases.