Enums and Comments

+Treatment.TreatmentLocation attribute
+Treatment.TreatmentDone atribute
+Getters/Setters of said attributes
*Modefied contors to said attributes

+Added enums package
+Added ServiceClass enum
*Changed Patient.ServiceClass type to ServiceClass enum, and made
appopriate changes.
+Added MedicineType enum
*Changed Medicine.MedicineType type to MedicineType enum, and made
appopriate changes.

+Added package-info.java files to enitities and enums packages.

+Added commnets to all classes