title: Drop down widget with adding choices in admin page
body: <p>i want to create a Drop-Down Widget with choices which can be added in the admin page. I was thinking of creating a model for the choices and registering these in the admin webpage and implementing this model into a Form but i can´t seem to grasp on how to go about solving this.
  Is my way of thinking in creating a model and implementing it in a Form / ModelForm the right way or is there a easier/better way ?</p>