Add docker go(pher) example

Author: jhart-r7

documentation/modules/auxiliary/scanner/gopher/gopher_gophermap.md

@@ -3,6 +3,35 @@
   Any gopher server will work.  There seems to only be [a few left](https://en.wikipedia.org/wiki/Gopher_(protocol)#Server_software)
    in 2017.
 
+  A few options for local installation and testing are below.
+
+### Docker Install
+
+A dockerized gopher server, written in Go of all things, is available.  To install and run this, with content being
+served out of a temporary directory in which you'll be left:
+
+```
+$  docker pull prodhe/gopher
+Using default tag: latest
+latest: Pulling from prodhe/gopher
+627beaf3eaaf: Already exists
+8800e3417eb1: Pull complete
+d9f3bcdad0eb: Pull complete
+c018073abd26: Pull complete
+b2855f535c50: Pull complete
+23480a2f73d8: Pull complete
+1555a5435ec5: Pull complete
+0728d289e0fc: Pull complete
+6f6f265b58ee: Pull complete
+Digest: sha256:69931d56946d192d9bd155a88b6f365cb276e9edf453129d374e64d244d1edaa
+Status: Downloaded newer image for prodhe/gopher:latest
+$  cd `mktemp -d`;
+$  sudo docker run --rm -d -it --name gopher_test -v `pwd -P`:/public  -p 70:70  prodhe/gopher
+2017/10/20 16:45:01 Serving /public/ at localhost:70
+$ date > test.txt
+$ echo HELLO > README.md
+```
+
 ### Ubuntu 16.04 Install
 
 First we need to install the server:
@@ -67,23 +96,34 @@ The following table contains the file types associated with the characters:
 
   **PATH**
 
-  It is possible to view content within a directory of the gophermap.  If the intial run shows directory `Directory: foobar`, 
+  It is possible to view content within a directory of the gophermap.  If the intial run shows directory `Directory: foobar`,
   setting **path** to `/foobar` will enumerate the contents of that folder.  Default: [empty string].
 
 ## Scenarios
 
+### Docker Gopher Server
+```
+msf auxiliary(gopher_gophermap) > run
+
+[+] 127.0.0.1:70          -   Text file: README.md
+[+] 127.0.0.1:70          -     Path: localhost:70/README.md
+[+] 127.0.0.1:70          -   Text file: test.txt
+[+] 127.0.0.1:70          -     Path: localhost:70/test.txt
+[*] Scanned 1 of 1 hosts (100% complete)
+[*] Auxiliary module execution completed
+```
 ### Gopher-server on Ubuntu 16.04
 
 ```
-msf > use auxiliary/scanner/gopher/gopher_gophermap 
+msf > use auxiliary/scanner/gopher/gopher_gophermap
 msf auxiliary(gopher_gophermap) > set rhosts 1.1.1.1
 rhosts => 1.1.1.1
 msf auxiliary(gopher_gophermap) > set verbose true
 verbose => true
 msf auxiliary(gopher_gophermap) > run
 
 [+] 1.1.1.1:70      - gopher custom gophermap
-[+] 1.1.1.1:70      - 
+[+] 1.1.1.1:70      -
 [+] 1.1.1.1:70      -   HTML: Hello World
 [+] 1.1.1.1:70      -     Path: 1.1.1.1:70/example.html
 [+] 1.1.1.1:70      -   Text file: Foo File