Create the practioner model
Add ActiveAdmin gem to manage admin pages
Deactivate user authentication for the admin pages
Create the default admin pages for practitioners
Create the specialisation model
Create the default admin pages for specialization
Enable specialization creation in admin pages
Add validations on specialisation model

Force presence and uniqueness
Add specialisations in the seeds file
Add a specialization to practitioners
Enable practitioners admin edition
Add validations to practitioners

Force presence of columns (except latitude and longitude)
Add 6 practitioners examples in the seed file