first commit, structure of the code and a non-tested recursive algorithm
adding structure for testing
backgracking algorithm working. Restrictions improvement working (yet not optimal, but it's what I can do in less that half an hour and after 12 hour work day)
Merge branch 'master' of https://github.com/leomrocha/sudoku
adding minimal changes in doc and comments, added tries for sudoku generation. Added files README and LICENSE
improved comments, added choice of dumb recursion or constraints
writing tests
writing tests
more testing, included non reject, accept, non accept, and solve
tests quite comprehensive now. TODO many  many tests yet
adding missing files
sudoku generator working, some tests and more generation complexity (levels evaluated not only in the number of zeros, permutations, and other things for example)