[WIP] Writing README.md

README.md

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 # BeagleBoneBlack Java Pin Bridge
+This is a pure Java library to access the GPIO pins of a BeagleBoneBlack.
+
+The main component is the `GpioBridge` which is a singleton. A client will retrieve the instance via the `GpioBridge.getInstance()` method and then manipulate the GPIOs.
+
+Features are:
+* Reading and Writing of pins
+* Registering for input pin changes
+* 
+
 
 ## Setup