Added guide for getting started on Linux.

Reviewed By: svcscm

Differential Revision: D2936728

fb-gh-sync-id: ead3daf31b624e096b12fa8db892724667e87f51
shipit-source-id: ead3daf31b624e096b12fa8db892724667e87f51

docs/GettingStarted.md

@@ -4,7 +4,7 @@ title: Getting Started
 layout: docs
 category: Quick Start
 permalink: docs/getting-started.html
-next: android-setup
+next: getting-started-linux
 ---
 
 ## Requirements
@@ -31,9 +31,17 @@ _NOTE:_ There is experimental [Windows and Linux support](docs/linux-windows-sup
 
 ## Quick start
 
+Install the React Native command line tools:
+
     $ npm install -g react-native-cli
+
+__NOTE__: If you see the error, `EACCES: permission denied`, please run the command: `sudo npm install -g react-native-cli`.
+
+Create a React Native project:
+
     $ react-native init AwesomeProject
 
+
 **To run the iOS app:**
 
 - `$ cd AwesomeProject`