Create SECURITY.md

Author: neel1996

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+>The back-end of the project was migrated from Node JS to Golang after release v2.0.0, so the versions before v2 will not be supported with bug fixes or security patches
+
+| Version | Supported          |
+| ------- | ------------------ |
+| >= 2.0.0   | :white_check_mark: |
+| < 2.0.0   | :x:                |
+| 1.x.x   | :x:                |
+
+## Reporting a Vulnerability
+
+If you find any potential security issues, then please do report it [here](https://github.com/neel1996/gitconvex/issues/new?assignees=&labels=security-issue&template=bug_report.md&title=Security%20Issue&assignee=neel1996)