added description of Odd Numbers challenge
solved Odd Numbers challenge using Scala
added description of File Size challenge
included sample input file to File Size challenge
solved File Size challenge using Scala
added description of Unique Elements challenge
included sample input file to Unique Elements challenge
solved Unique Elements challenge using Scala
added description of Set Intersection challenge
included sample input file to Set Intersection challenge
solved Set Intersection challenge using Scala
added description of Rightmost Char challenge
included sample input file to Rightmost Char challenge
solved Rightmost Char challenge using Scala
added description of Happy Numbers challenge
included sample input file to Happy Numbers challenge
fixed package and object name
solved Happy Numbers challenge using Scala