Add generation cli to generate commands

[Omar Abdelhafith]

Add generation cli application
This application will be able to

1. generate a new root command guaka new "name"
2. create new subcommands guaka add "name"
3. add subcommands to a particular command guaka add "name" -p "parent"
4. add flags to a command guaka add flag --longname "name" --shortname "name" --type ...