Properly declared a 2D array
added a trial window system.
Added a toString() method to Tetromino. Changed the constant array, particularly the l-shape array to better reflect the rotation behavior of Tetrominos in Tetris. Added a test method to test basic behavior of the Tetromino class to Main.java
Added a test method to Tetromino
Altered test() to a static method.
Changed tetrominoTest() to reflect change in the Tetromino class(). Moved TETROMINOS inside the Tetromino class. Fixed a compiler error by adding a brace.