Update doc

Author: wchen-r7

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

@@ -21,3 +21,15 @@ https://software.cisco.com/download/release.html?mdfid=286259687&softwareid=2862
 6. ```set lhost [IP]```
 7. ```exploit```
 8. You should get a session
+
+## Options
+
+*USERNAME* The username for Cisco Firepower Management console
+
+*Password* The password for Cisco Firepower Management cosnole
+
+*NEWSSHUSER* The SSH account to create. By default, this is random.
+
+*NEWSSHPASS* The SSH password for the new account. By default, this is also random.
+
+*SSHPORT* In case for some reason, the SSH changed, otherwise this is 22 by default.