Move yoga docs into docs folder on master branch

Summary: Move yoga docs into master branch so that pull requests are able to include doc updates as part of other changes.

Reviewed By: JoelMarcey

Differential Revision: D4365700

fbshipit-source-id: 2f46a88974104c454c00bcdf1257abb5c4075a68

docs/_docs/getting-started.md

@@ -0,0 +1,28 @@
+---
+docid: getting-started
+title: Getting Started
+layout: docs
+permalink: /docs/getting-started/
+---
+
+## Installation
+
+Installation of Yoga is currently a manual process. We have plans on bringing Yoga to the many available package management systems (e.g., [Yarn](https://yarnpkg.com/), [Gradle](https://gradle.org/), [Cocoapods](https://cocoapods.org/)), but we do not have a target date at this time. We would greatly appreciate [community contributions here](https://github.com/facebook/yoga/pulls).
+
+### Getting the Code
+
+For now we recommend including Yoga as a [git submodule](https://git-scm.com/docs/git-submodule) in your project. Once done, you can either build Yoga using Buck (detailed [below](#building-with-buck)) or integrate it into your existing build system by including the C library from the [root `yoga` directory](https://github.com/facebook/yoga/tree/master/yoga) as well as the [language bindings](https://github.com/facebook/yoga) (e.g., Java, C#) you wish to use.
+
+### Running the Example
+
+Yoga ships with an [iOS example](https://github.com/facebook/yoga/tree/master/YogaKit/YogaKitSample). To get it running:
+
+<script src="https://gist.github.com/emilsjolander/903b16185b24c957acc4cd250c6e73d9.js"></script>
+
+### Building with Buck
+
+Yoga uses [Buck](https://buckbuild.com/) as its build system. Buck is not required for using Yoga, but, if you already use Buck, then integrating Yoga is very simple.
+
+If you are using Buck all you need to do is reference the language bindings you want to use in your `BUCK` file.
+
+<script src="https://gist.github.com/emilsjolander/895b4ec79425882b8d4676b6545d6943.js"></script>