Add documentation

Author: bcoles

documentation/modules/auxiliary/scanner/nntp/nntp_login.md

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+## Description
+
+  This module attempts to authenticate to NNTP services which support the AUTHINFO authentication extension.
+
+  This module supports AUTHINFO USER/PASS authentication, but does not support AUTHINFO GENERIC or AUTHINFO SASL authentication methods.
+
+  If you have loaded a database plugin and connected to a database this module will record successful logins and hosts so you can track your access.
+
+
+## Vulnerable Application
+
+  This module has been tested successfully on:
+
+  * [SurgeNews](http://netwinsite.com/surgenews/) on Windows 7 SP 1.
+  * [SurgeNews](http://netwinsite.com/surgenews/) on Ubuntu Linux.
+  * [INN2](https://www.eyrie.org/~eagle/faqs/inn.html) on Debian Linux.
+
+
+## Verification Steps
+
+  1. Do: `use auxiliary/scanner/nntp/nntp_login`
+  2. Do: `set RHOSTS [IP]`
+  3. Do: `set RPORT [IP]`
+  4. Do: `run`
+
+
+## Scenarios
+
+  ```
+  msf auxiliary(nntp_login) > run
+
+  [+] 172.16.191.166:119 - 172.16.191.166:119 Successful login with: 'asdf' : 'asdf'
+  [+] 172.16.191.166:119 - 172.16.191.166:119 Successful login with: 'zxcv' : 'zxcv'
+  [+] 172.16.191.166:119 - 172.16.191.166:119 Successful login with: 'test' : 'test'
+  [*] Scanned 1 of 2 hosts (50% complete)
+  [+] 172.16.191.213:119 - 172.16.191.213:119 Successful login with: 'asdf' : 'asdf'
+  [+] 172.16.191.213:119 - 172.16.191.213:119 Successful login with: 'admin' : 'admin'
+  [+] 172.16.191.213:119 - 172.16.191.213:119 Successful login with: 'user' : 'pass'
+  [*] Scanned 2 of 2 hosts (100% complete)
+  [*] Auxiliary module execution completed
+  ```
+