doing housekeeping and prepare commands

mark@nb:~/zzz/sudoku1$ java -jar target/sudoku1-1.0.jar 

 *===============*
 *    Question   *
 *===============*
 . . 9 . 3 6 . 4 .
 . . 8 . 7 . 3 1 .
 . . 7 . . . . 6 .
 . . . . . . . 5 .
 . 9 . 6 4 2 . 3 .
 . 7 . . . . . . .
 . 2 . . . . 4 . .
 . 8 1 . 9 . 6 . .
 . 4 . 5 8 . 9 . .

 *===============*
 *    Answer     *
 *===============*
 2 1 9 8 3 6 5 4 7
 4 6 8 9 7 5 3 1 2
 3 5 7 4 2 1 8 6 9
 8 3 4 7 1 9 2 5 6
 1 9 5 6 4 2 7 3 8
 6 7 2 3 5 8 1 9 4
 9 2 3 1 6 7 4 8 5
 5 8 1 2 9 4 6 7 3
 7 4 6 5 8 3 9 2 1


 *===============*
 *    TODO       *
 *===============*
 ...interactive mode

 *===============*
 *    Command    *
 *===============*
 new, to start a new game 
 run, to perform auto solving 
 show, to display current Sudoku 
 a123456789, to assign value 123456789 to row a 
 a1=9, to assign value 9 to cell a1
 *===============*
 *    DOING      *
 *===============*
 final 5 classes: 
 1. Sudoku: data 
 2. Solver: run 
 3. Core: for Solver 
 4. Possible: for Solver 
 5. Coordinate: coordination system, for Sudoku, Core and Possible