Add build instructions section to docs folder

docs/advanced/build-instructions.md

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+* [Linux instructions](#linux)
+* [OS X instructions](#os-x)
+* [Windows instructions](#windows)
+
+# Linux
+
+Ubuntu LTS 12.04 64-bit is the recommended platform.
+
+#### Requirements
+
+  * OS with 64-bit architecture
+  * [node.js](http://nodejs.org/download/) v0.10.x
+  * [npm](http://www.npmjs.org/) v1.4.x  
+  * libgnome-keyring-dev `sudo apt-get install libgnome-keyring-dev`
+  * `npm config set python /usr/bin/python2 -g` to ensure that gyp uses Python 2
+
+#### Instructions
+
+  ```sh
+  git clone https://github.com/atom/atom
+  cd atom
+  script/build # Creates application at /tmp/atom-build/Atom
+  sudo script/grunt install # Installs command to /usr/local/bin/atom
+  script/grunt mkdeb # Generates a .deb package at /tmp/atom-build
+  ```
+
+# OS X
+
+#### Requirements
+
+  * OS X 10.8 or later
+  * [node.js](http://nodejs.org/download/) v0.10.x
+  * Command Line Tools for [Xcode](https://developer.apple.com/xcode/downloads/) (run `xcode-select --install` to install)
+
+#### Instructions
+
+  ```sh
+  git clone https://github.com/atom/atom
+  cd atom
+  script/build # Creates application at /Applications/Atom.app
+  ```
+
+# Windows
+
+#### Requirements
+
+  * Windows 7 or later
+  * [Visual C++ 2010 SP1 Express](http://www.visualstudio.com/en-us/downloads/download-visual-studio-vs#DownloadFamilies_4)
+  * [node.js - 32bit](http://nodejs.org/download/) v0.10.x
+  * [Python 2.7.x](http://www.python.org/download/)
+  * [GitHub for Windows](http://windows.github.com/)
+  * [Git for Windows](http://git-scm.com/download/win)
+    * Select the option **Use Git from the Windows Command Prompt** when installing (Git needs to be in your `PATH`)  
+  * Add `C:\Python27;C:\Program Files\nodejs;C:\Users\<user>\github\atom\node_modules\`
+    to your PATH
+
+#### Instructions
+
+  ```bat
+  cd C:\Users\<user>\github
+  git clone https://github.com/atom/atom/
+  cd atom
+  script\build
+  ```