First cut at build documentation

docs/building-atom.md

@@ -0,0 +1,33 @@
+## Building Atom
+
+These guide is meant only for users who wish to help develop atom core,
+if you're just intersted in using atom you should just [download
+atom][download].
+
+## OSX
+
+* Use Mountain Lion
+* Install the latest node 0.10.x release (32bit preferable)
+* Clone [atom][atom-git] to `~/github/atom`
+* Run `~/github/atom/script/bootstrap`
+
+## Windows
+
+* Install [Visual C++ 2010 Express][win-vs2010]
+* Install the [latest 32bit Node 0.10.x][win-node]
+* Install the [latest Python 2.7.x][win-python]
+* Install [Github for Windows][win-github]
+* Clone [atom/atom][atom-git] to `C:\Users\<user>\Documents\GitHub\atom\`
+* Add `C:\Python27;C:\Program Files\nodejs;C:\Users\<user>\Documents\GitHub\atom\node_modules\`
+  to your PATH
+* Set ATOM_ACCESS_TOKEN to your oauth2 credentials (run `security -q
+  find-generic-password -ws 'GitHub API Token'` on OSX to get your
+  credentials).
+* Use the Windows GitHub shell and cd into `C:\Users\<user>\Documents\GitHub\atom`
+* Run `node script/bootstrap`
+
+[download]: http://www.atom.io
+[win-node]: http://nodejs.org/download/
+[win-python]: http://www.python.org/download/
+[win-github]: http://windows.github.com/
+[atom-git]: https://github.com/atom/atom/