Add SECURITY.md

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Author: hamzaremmal

SECURITY.md

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+# Security Policy
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+The details about the security policy of the Scala Programming Language organisation can be found in [https://scala-lang.org/security](https://scala-lang.org/security).
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+For any additional information related to our security policy, please contact [security@scala-lang.org](mailto:security@scala-lang.org).