Support creation

[romanr]

Is your feature request related to a problem? Please describe.
When adding for example labels using this control, to be able to create item, not only select from existing.

Describe the solution you'd like
Type name of Chip item, and press Enter (or button) to create.

Describe alternatives you've considered
n/a

Additional context
n/a

[TheAlphamerc]

Seems like a promising feature. Any PR is welcome here.