Merge pull request #5 from VladislavPovedyuk/doctors_controller

Doctors controller
added landing page and some fixes to doctors_controller
Merge pull request #7 from VladislavPovedyuk/landing_page

added landing page and some fixes to doctors_controller
Merge pull request #6 from VladislavPovedyuk/dev

Dev
Added views for Doctors CRUD and some fixes to controller