Create SECURITY.md

Author: Lulalaby

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 2.0.0   | :white_check_mark: |
+| 1.7.x   | :white_check_mark: |
+| < 1.7.3 | :x:                |
+
+## Reporting a Vulnerability
+
+If you find a vulnerability you have two ways to report it:
+- Write us on https://pycord.dev/discord
+- Open an [issue](https://github.com/Pycord-Development/pycord/issues/new/choose)