Create SECURITY.md (flyteorg#4030)

Signed-off-by: Haytham Abuelfutuh <[email protected]>

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+Flyte follows the n-1 model when it comes to patching security vulnerabilities. That means current (latest) release as well as the version before that will be patched regularly.
+
+## Reporting a Vulnerability
+
+Please use the button at the security tab under any of the repositories in flyte to report a potential vulnerability. If you are not sure which repository a vulnerability belongs to,
+please use this one: https://github.com/flyteorg/flyte/security/
+
+You should expect an acknowledgement of your report within the first 48 hours. Depending on the severity of the issue reported, the reporter may be contacted more frequently afterwards.
+We do take every security issue very seriously and patch promptly when appropriate.