Added readme

README.md

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+Start up a Pi running Raspbian, and connect it to your network.
+
+Connect a red LED to BCM 19, and a green one to BCM 26.
+
+Download this git repo.
+
+Install the requirements from `requirements.txt`.
+
+Run the app with `python app.py`.
+
+Load up the browser from inside the network.
+
+Press the buttons to toggle the state of the LEDs.