Create SECURITY.md for security policy

[231B145-JUET]

Add a security policy document outlining supported versions and vulnerability reporting.

First time contributor checklist

• I have read how to contribute to this project
• I have signed the Contributor License Agreement

Contributor checklist

• I am following the Code Style Guidelines
• I have tested my contribution on these devices:

• Device A, Android X.Y.Z
• Device B, Android Z.Y
• Virtual device W, Android Y.Y.Z

• My contribution is fully baked and ready to be merged as is
• I ensure that all the open issues my contribution fixes are mentioned in the commit message of my first commit using the Fixes #1234 syntax

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Description