[mod] add missing type
[enh] foundations to the possibility to add a todo
[enh] yay, code to add a todo \o/
[enh] shortcut to add a todo
[enh] yay, add help \o/
[enh] display help if the command is unknown
[enh] if the db doesn't exist, create it
[fix] sometime I don't get the correct data
[enh] print if there is not todos