Update Sky README.md

sky/sdk/README.md

 Sky SDK
 =======
 
-This repository is autogenerated by:
-https://github.com/domokit/mojo/tree/master/sky/tools/deploy_sdk.py
+We're still iterating on Sky heavily, which means the framework and underlying
+engine are both likely to change in incompatible ways several times, but if
+you're interested in trying out the system, this document can help you get
+started.
 
-To add files, add them to:
-https://github.com/domokit/mojo/tree/master/sky/sdk
+Set up your computer
+--------------------
+
+1. Install the Dart SDK:
+  - https://www.dartlang.org/tools/download.html
+
+2. Install the ``adb`` tool from the Android SDK:
+  - https://developer.android.com/sdk/installing/index.html
+
+3. Install the Sky SDK:
+  - ``git clone https://github.com/domokit/sky_sdk.git``
+
+4.  Ensure sure $DART_SDK is set to the path of your Dart SDK and 'adb'
+    (inside 'platform-tools' in the android sdk) is in your $PATH.
+
+Set up your device
+------------------
+
+Currently Sky requires an Android device running the Lollipop (or newer) version
+of the Android operating system.
+
+1. Enable developer mode on your device by visiting ``Settings > About phone``
+   and tapping the ``Build number`` field five times.
+
+2. Enable ``USB debugging`` in ``Settings > Developer options``.
+
+3. Using a USB cable, plug your phone into your computer. If prompted on your
+   device, authorize your computer to access your device.
+
+Running a Sky application
+-------------------------
+
+1. ``sky_sdk/bin/sky --install sky_sdk/examples/index.sky``
+   The --install flag is only necessary the first time to install SkyDemo.apk.
+
+2.  Use ``adb logcat`` to view any errors or Dart print() output from the app.