Adding the Mobile page.

Mobile.md

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+# Go on Mobile
+
+With Go 1.5, Go will be support mobile platforms (Android and iOS) and
+will provide tools to build mobile applications.
+
+There are two strategies you can follow to include Go into
+your mobile stack:
+
+- Writing all-Go native mobile applications.
+- Writing SDK applications by generating bindings from a Go package and invoke them from Java (on Android) and Objective-C (on iOS).
+
+This article will contain step-by-step guides to explain how to achieve
+these strategies.
+
+## Tooling
+
+Go Mobile introduces a new tool, gomobile, to help you with the build
+and the binding process. Go get gomobile and initialize it to install
+the required toolchain.
+
+On Mac OSX, you will need to have
+[Xcode Command Line Tools](https://developer.apple.com/downloads/)
+installed.
+
+```
+$ go get golang.org/x/mobile/cmd/gomobile
+$ gomobile init # it might take a few minutes
+```
+
+(The following sections will help you how to use the gomobile tool.)
+
+## Native applications
+
+TBD
+
+## SDK applications and generating bindings
+
+TBD