regions

Hello!
I would like to save metadata with each file that is created, similarly to pyGRETA.
I have already copied the function create_json in util.py. All that is needed, is a line of code calling that function after each file is created.
I could do it myself, but it is also an easy task for future maintainers :-)

The idea is simple.
We had 4 hierarchy such us below.

| Province
|---- Regency
|-------- District
|------------Village

Let say Regency A selected, then populate All District under Regency A. Including the village.