Is your feature request related to a problem? Please describe.
Nope, this is not related to any problem.

Describe the solution you'd like
DOCPLEX is great for specifying optimization problems and supporting it in qbitkit should not be too difficult.

Describe alternatives you've considered
Qiskit and DOCPLEX are both IBM products, so as you would expect they work together quite nicely.

Additional context
No additional dependencies would be needed as DOCPLEX is installed when you install Qiskit, which is installed when you install qbitkit.