Create SECURITY.md (#685)

Author: thebuilder

SECURITY.md

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+# Security Policy
+
+## Reporting a Vulnerability
+
+If you discover a security vulnerability within the `react-intersection-observer` package or have any security concerns, 
+please [create a new issue](https://github.com/thebuilder/react-intersection-observer/issues?q=sort%3Aupdated-desc+is%3Aissue+is%3Aopen) on the Github repository. 
+
+We appreciate your responsible disclosure.