Adding files for handling serial port communication in java

Created a custom input stream with function getNewMessage() for getting interpreted input from serial port back;
Created interface defining a TouchKeyListener, will create a concrete implementation of this using the TouchKeyStream next

New files are still untested as it is difficult to test on my laptop but files compile, see README for compilation command
Will add a makefile one I have a better idea of what the final product looks like
Added external library for java serial communication, apparently this is not supported in the default java jre

Need to find a better place to put comm-2.0.jar and other external libraries later