Add a docs stub for the module.

library/windows/win_ping

+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+
+# (c) 2012, Michael DeHaan <michael.dehaan@gmail.com>, and others
+#
+# This file is part of Ansible
+#
+# Ansible is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# Ansible is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
+
+# this is a windows documentation stub.  actual code lives in the .ps1
+# file of the same name
+
+DOCUMENTATION = '''
+---
+module: win_ping
+version_added: "1.7"
+short_description: A windows version of the classic ping module.
+description:
+     - Checks management connectivity of a windows host
+author: Michael DeHaan
+'''
+
+EXAMPLES = '''
+# Example from an Ansible Playbook
+- action: win_ping
+'''
+