Initial commit, start use of git source control

	new file:   Makefile
	new file:   field.cpp
	new file:   field.h
	new file:   illegalNumberException.h
	new file:   sudoku.cpp
	new file:   sudoku.h
	new file:   test.cpp
update makefile to actually build a static library
Merge branch 'master' of https://github.com/kaffeesucht/libsudoku

merge is necessary to get readme and license from github repo