adding metasploit info

metasploit_resources/README.md

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+# Metasploit Resources
+
+* [Offensive Security Metasploit Unleashed Free Course](https://www.offensive-security.com/metasploit-unleashed/) - a free course from the folks at Offensive Security created to help raise awareness for underprivileged children in East Africa. Please make a donation to the Hackers For Charity non-profit 501(c)(3) organization. A sum of $9.00 will feed a child for a month, so any contribution makes a difference.
+
+* Don't forget to always update Metasploit - `msfupdate`
+
+* [A Good Summary of Metasploit Commands](https://www.hackingtutorials.org/metasploit-tutorials/metasploit-commands/)