Add win_get_url module documentation

library/windows/win_get_url

+DOCUMENTATION = '''
+---
+module: win_get_url
+version_added: "1.7"
+short_description: Fetches a file from a given URL
+description:
+     - Fetches a file from a URL and saves to locally
+options:
+  url:
+    description:
+      - The full URL of a file to download
+    required: true
+    default: null
+    aliases: []
+  dest:
+    description:
+      - The absolute path of the location to save the file at the URL. Be sure to include a filename and extension as appropriate.
+    required: false
+    default: yes
+    aliases: []
+author: Paul Durivage
+'''
+
+EXAMPLES = '''
+# Downloading a JPEG and saving it to a file with the ansible command.
+# Note the "dest" is quoted rather instead of escaping the backslashes
+$ ansible -i hosts -c winrm -m win_get_url -a "url=http://www.example.com/earthrise.jpg dest='C:\Users\Administrator\earthrise.jpg'" all
+
+# Playbook example
+- name: Download earthrise.jpg to 'C:\Users\RandomUser\earthrise.jpg'
+  win_get_url:
+    url: 'http://www.example.com/earthrise.jpg'
+    dest: 'C:\Users\RandomUser\earthrise.jpg'
+'''
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