Add public readme from existing predictionbook repository

README.md

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+PredictionBook
+==============
+
+[PredictionBook](http://predictionbook.com/) is a site to record and
+track your predictions.
+
+## How sure are you?
+
+Rather than just recording what you think will happen, PredictionBook
+allows you to record just how sure you are that it will happen. You can
+distinguish between those things you think will probably occur, and
+those things you're really really sure will occur. If you're properly
+calibrated, you'll be able to see that about 60% of the things you're
+60% sure will happen, do happen, and 90% of the things you're 90% sure
+will happen, do happen.
+
+## History
+
+PredictionBook was originally written by
+[TrikeApps](http://trikeapps.com/), the geeking arm of the [Investling
+Group](http://investling.com/). It is now an open source project [hosted
+at GitHub](https://github.com/tricycle/predictionbook).
+
+## License
+
+[BSD](http://creativecommons.org/licenses/BSD/)
+
+## Installation
+
+See INSTALL.