Adding WordCount java file

Adding WordCount.java file. The WordCount object holds the word along
with the associated number of instances occurring within the sentence.
Also, Creating basic directory structure for java source code.
Adding MapData java file

Adding MapData.java file. MapData is the message that is passed from
the Map actor to Reduce actor.
Adding ReduceData java file

Adding ReduceData.java file. ReduceData is the message passed between
the Reduce actor and the Aggregate actor.
Adding Result java file

Adding Result.java file. Result is the message passed by the Master
actor to Aggregate actor whenever the aggregated results need to be
obtained.