Revert "remove unlinked Using-Metasploit page"

This reverts commit cd5ce7edc1.

Using-Metasploit.md

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+Start here:
+
+* http://www.offensive-security.com/metasploit-unleashed/Main_Page
+* https://metasploit.help.rapid7.com/docs/
+* http://docs.kali.org/general-use/starting-metasploit-framework-in-kali
+* https://github.com/rapid7/metasploitable3
+* [[Evading Anti-Virus]]
+
+Database troubleshooting
+------------------------
+If the database is not connecting automatically, first make sure it is running:
+* Linux:`$ netstat -lnt | grep 7337` where 7337 is whatever port you told it to listen on during installation
+* Windows: look for a postgres.exe process in task manager.
+
+If postgres is not running, try starting it manually:
+* Linux:`$ sudo /etc/init.d/metasploit start` or if you didn't choose to install as a service: `$ sudo /opt/metasploit*/ctlscript.sh start`
+* Windows: Start -> Metasploit -> Services -> Start Services
+
+Once postgres is running and listening, go back to msfconsole:
+
+```
+msf > db_connect
+```