[Minesweeper] Completed minesweeper
[Minesweeper] Added unit tests
[Minesweeper] Added UML and a README
[Minesweeper] Updated the documentation for Minesweeper.java
[Minesweeper] Added documentation for SweeperEvent.java
[Minesweeper] Added documentation for Frame.java
[Minesweeper] Updated the documentatino for the test cases
[Minesweeper] Updated README with project layout