Add module documentation for jenkins_udp_broadcast_enum

Author: wchen-r7

documentation/modules/auxiliary/scanner/jenkins/jenkins_udp_broadcast_enum.md

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+Jenkins is an open source tool that provides continuous integration services for software
+development. This module will attempt to find Jenkins servers by performing a UDP
+broadcast.
+
+To use this module, you should be on the same network as the Jenkins server(s).
+
+
+## Verification Steps
+
+To test this module, you must make sure there is at least one Jenkins server on the same network.
+To download Jenkins, please follow this link:
+
+[https://jenkins.io/](https://jenkins.io/)
+
+
+## Options
+
+Unlike most Metasploit modules, jenkins_udp_broadcast_enum does not have any datastore options
+to configure. So all you have to do is load it, and run, like this:
+
+```
+msf auxiliary(jenkins_udp_broadcast_enum) > run
+
+[*] Sending Jenkins UDP Broadcast Probe ...
+[*] 192.168.1.96 - Found Jenkins Server 1.638 Version
+[*] Auxiliary module execution completed
+```
+Once you have found the Jenkins server, you should be able to browse to the web server.
+And by default, that port is 8080.