Cleanup of project description.
Merge branch 'develop' into feature/Refactoring_comments_mainly
main comment cleanup
Shift project description out of main and took out no longer relevant project credentials.
readme.md added with rough project description
Fix cout in main.cpp preventing compilation
Took non relevant information out of notes.txt
Readme formatting now changed to github style markdown
Deconstructor not needed so it is now eliminated.
Added appropriate comments to contents of copy(other sodoku) and eliminated duplicate working_cell copy.
Comments cleaned and migrated to doxygen style.
Took out unneeded curly braces in check row and column
Refactored check_sodoku_validty slightly.
Slight solve_puzzle_partially(percent) refactoring.
Added info for partial_solve_percentage to indicate not to use for already partially solved puzzles.
Slight solve_puzzle_partially_count refactoring.
Took out debugging info in solve_puzzke_partial_count
Took out debugging info in solve_puzzle_partial
Slight refactor of thread_solver
Comment cleanup for solver_for_threads