Create SECURITY.md

Signed-off-by: eeliu <[email protected]>

Author: eeliu

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 4.x.x   | :white_check_mark: |
+| 3.x.x   | :white_check_mark:  |
+| 2.x.x   | :x:  |
+
+## Reporting a Vulnerability
+
+* [Email Us](mailto:[email protected])
+* Submit an [issue](https://github.com/pinpoint-apm/pinpoint-c-agent/issues)