Add windows installation instructions (#2124)

* Add windows installation instructions

* Add logo, video, and remove from navigation

source/_docs/installation/windows.markdown

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+---
+layout: page
+title: "Installation on a Windoes system"
+description: "Instructions to install Home Assistant on a Microsoft Windows system."
+date: 2017-02-23 11:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+---
+
+To run Home Assistant on Microsoft Windows installation you need to install Python first. Download Python for https://www.python.org/downloads/windows/ and follow the instructions of the installer.
+
+Start 
+
+```bash
+C:\...\> pip3 install homeassistant
+C:\...\> py -m homeassistant --open-ui
+```
+
+For autostarting Home Assistant please refer to this [guide](https://community.home-assistant.io/t/autostart-on-windows/3504).
+
+Check this [video](https://www.youtube.com/watch?v=X27eVvuqwnY) for the installation on Windows 10.
+
+<p class='note warning'>
+The Microsoft Windows platform is not a primary target to install home Assistant. Also, not all tools and third-party modules will work.
+</p>