first commit
Fix files problems
Merge branch 'develop' into aurel
add class Group & Database
Add Test, Improve Group, Database
Merge branch 'aurel' into develop
Clean files
Merge remote-tracking branch 'origin/develop' into David
Merge branch 'develop' into David
change user.cs
change user.cs
Merge branch 'David' into develop
add network and some graphical interface
add network and some graphical interface
update GUI
add save and load
add git ignore and create group's button automatically
fix problems (2)
fix problem 3
fix problem 3