chore: add security policy (#5)

Author: hamzaremmal

.github/SECURITY.md

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+<h1 align=center>Scala's Security Policy</h1>
+
+
+- The `workshop.scala-lang.org` domain is complaint with [RFC 9116](https://www.rfc-editor.org/rfc/rfc9116).
+  - See [/.well-known/security.txt](https://workshop.scala-lang.org/.well-known/security.txt).
+- 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).
+- For any additional information related to our security policy, please contact [[email protected]](mailto:[email protected]).