Update README.md

Author: ShubhamJagtap2000

15 - Additional Resources/README.md

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 # More Resources and Further Studies
+
+### [1. List of Metasploit Learning Resouces](https://www.rapid7.com/resources/?p=Metasploit)
+### [2. Rapid7](https://docs.rapid7.com/metasploit/)
+### [3. Varonis Blogs](https://www.varonis.com/blog/what-is-metasploit)
+### [4. SecurityTube Metasploit Framework Expert](http://www.securitytube.net/groups?operation=view&groupId=10)
+### [5. ClassCentral - Metasploit Courses List](https://www.classcentral.com/subject/metasploit)