chord progression template

[sugizo]

Is your feature request related to a problem? Please describe.
nice to have chord progression template, e.g. ii–V–I
then user can modified it, add or delete the base template

ref
https://en.wikipedia.org/wiki/Chord_progression
https://en.wikipedia.org/wiki/List_of_chord_progressions

thanks

[fanzhangg]

Template is a great tool and is what we wanted to add at first. It takes some work to achieve the function, so I will work on the feature when I have more free time!