Add docs for memcached_udp_version

documentation/modules/auxiliary/scanner/memcached/memcached_udp_version.md

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+## Vulnerable Application
+
+Any instance of memcached with the UDP listener enabled will suffice.
+
+Instructions for testing against CentOS 7 and a Dockerized endpoint are provided below.
+
+### CentOS 7
+
+To a CentOS 7 instance, simply install and start memcached, as it listens on 0.0.0.0 by default'
+
+```
+yum -y install memcached
+systemctl start memcached
+```
+
+### Docker Install
+
+In memcached 1.5.5 and earlier, the daemon is affected by default.  As such, we can use the
+community supported memcached container and simply expose it:
+
+```
+docker run -ti --rm -p 11211:11211/udp memcached:1.5.5
+```
+
+## Verification Steps
+
+
+  1. Install the application
+  2. Start msfconsole
+  3. Do: `use auxiliary/scanner/memcached/memcached_udp_version`
+  4. Do: `set rhosts [IPs]`
+  5. Do: `run`
+  6. Confirm that the endpoint is discovered to be running memcached and the version is displayed
+
+## Scenarios
+
+### CentOS 7
+
+Configure memcached as described above.
+
+```
+msf5 > use auxiliary/scanner/memcached/memcached_udp_version
+msf5 auxiliary(scanner/memcached/memcached_udp_version) > set RHOSTS a.b.c.d
+RHOSTS => a.b.c.d
+msf5 auxiliary(scanner/memcached/memcached_udp_version) > run
+
+[+] a.b.c.d:11211/udp memcached version 1.4.15
+[*] Scanned 1 of 1 hosts (100% complete)
+[*] Auxiliary module execution completed
+```
+
+### Docker
+
+Configure memcached in docker as described above.
+
+```
+msf5 > use auxiliary/scanner/memcached/memcached_udp_version
+msf5 auxiliary(scanner/memcached/memcached_udp_version) > set RHOSTS a.b.c.d
+RHOSTS => a.b.c.d
+msf5 auxiliary(scanner/memcached/memcached_udp_version) > run
+
+[+] a.b.c.d:11211/udp memcached version 1.5.5
+[*] Scanned 1 of 1 hosts (100% complete)
+[*] Auxiliary module execution completed
+```