added info about contributing
added info about contributing
TeachingKidsProgramming/TeachingKidsProgramming.Source.Java,ffino/TeachingKidsProgramming.Source.Java,ffino/TeachingKidsProgramming.Source.Java,TeachingKidsProgramming/TeachingKidsProgramming.Source.Java,ffino/TeachingKidsProgramming.Source.Java,TeachingKidsProgramming/TeachingKidsProgramming.Source.Java,TeachingKidsProgramming/TeachingKidsProgramming.Source.Java,ffino/TeachingKidsProgramming.Source.Java