Port over Windows support (#6)

* Port over Windows support

* Updates based on comments

* Update based on Chris Krycho's comments.

Author: Gaurav0

guides/basic-use/index.md

@@ -34,7 +34,8 @@ If Watchman is not installed, a notice is displayed when invoking various comman
 
 ### Installing for Windows
 
-<!-- copy over from ember-cli.com -->
+Windows Vista and newer Windows versions are fully supported, although there are steps you can take to improve your experience.
+You can find more information about this in our section on [Windows support](../reference/windows)
 
 ## Getting help
 

guides/reference/windows.md

@@ -1 +1,83 @@
-<!-- Port over info from existing site -->
+Windows Vista and newer Windows versions are fully supported.
+
+To get started ensure the following dependencies are installed:
+
+* Node.js - [https://nodejs.org/en/](https://nodejs.org/en/)
+* Git - [https://git-scm.com/](https://git-scm.com/)
+* Chrome - [https://www.google.com/chrome/](https://www.google.com/chrome/)
+
+### Performance
+
+Although supported, Windows performance, at least by default, isn't as good as
+on Linux or MacOS. On a positive note, this story continues to improve. Both
+Microsoft, and the Ember CLI team continue to work on improving these developer
+ergonomics.
+
+#### What causes the build slowdown?
+
+The two primary reasons are:
+
+* Lack of enabled-by-default symlinks
+* Generally slower FS operations on NTFS
+
+#### For the best possible Windows experience
+
+* Use Windows Subsystem Linux [Installation
+  Guide](https://msdn.microsoft.com/en-us/commandline/wsl/install_guide)
+
+#### Improving your Windows experience
+
+Ensure Search and Defender ignore your project's `tmp` directory:
+
+```bash
+npm install -g ember-cli-windows
+```
+
+Then, to start the automatic configuration, run:
+
+```bash
+ember-cli-windows
+```
+
+*Make sure you use an elevated PowerShell.* <!-- Needs Instructions -->
+If there was an error, try executing Set-ExecutionPolicy Unrestricted -scope Process first.
+
+[Read more about this from the Microsoft DX Open Source team](http://felixrieseberg.com/improved-ember-cli-performance-with-windows/)
+
+### Enabling symlinks
+
+To create symlinks the account running Ember CLI must have the
+`SeCreateSymbolicLinkPrivilege`. Users in the Administrators group have this
+permission already. However, if UAC (User Access Control) is enabled, users in
+the Administrators group must run their shell using Run As Administrator
+because UAC strips away certain permissions from the Administrators +group,
+including `SeCreateSymbolicLinkPrivilege`.
+
+![Run As Administrator]({{ site.url }}/assets/images/common-issues/run-as-admin.png)
+
+If the user account is not part of the Administrators group you will need to
+add the `SeCreateSymbolicLinkPrivilege` to allow the creation of symlinks. To
+do this open the `Local Security Policy` by typing Local Security Policy in the
+Windows `Run` Box.
+
+Under `Local Policies` -> `User Rights Assignment` find the `Create symbolic
+links` policy and double click it to add a new user or group. Once your user or
+group has been added, your user should be able to create symlinks. Keep in mind
+if your user is part of the Administrators group and UAC is enabled you will
+still need to start your shell using `Run as Administrator`.
+
+![Enabling Symlinks]({{ site.url }}/assets/images/common-issues/enabling-symlinks.png)
+
+### Issues With npm: `EEXISTS`, Path too Long, etc
+
+There were always two major issues with running Node.js on Windows: first and
+foremost, the operating system maintains a maximum length for path names, which
+clashes with Node's traditional way of nesting modules in `node_modules`. The
+second issue was a bit more subtle: The npm installer had a set of steps it
+executed for each package and it would immediately start executing them as soon
+as it decided to act on a package resulting in hard-to-debug race conditions.
+
+`npm` 3 is a nearly complete rewrite of `npm`, fixing both issues. Windows users of
+Ember Cli might want to make the switch to `npm` 3 to benefit from its
+flat module installation (solving most issues involving long path names) as well
+as its multi-stage installer.