adding readme

README

+The file TwitterStreamActor.java contains user/password details that must be filled in to get out of turing.
+Dynamic heatmap also opens a websocket on 50829 on turing, if you want to run this on a different port, remember to change port too.
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+I have left a version of the app running at the turing.une.edu.au:50829 that should be used to evaluate the app.
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+A registration and login must be created (can be done from the main app page, refer to demo vid to see how) before the app can be used.
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