(B) Add Doctor entity

Clinics.Backend/Domain/Entities/People/Doctors/Doctor.cs

+using Domain.Entities.People.Doctors.Shared;
+using Domain.Entities.People.Doctors.Shared.Constants.DoctorStatusValues;
+using Domain.Entities.People.Shared;
+using Domain.Primitives;
+
+namespace Domain.Entities.People.Doctors;
+
+public sealed class Doctor(int id) : Entity(id)
+{
+    #region Properties
+
+    public PersonalInfo PersonalInfo { get; set; } = null!;
+
+    public DoctorStatus Status { get; set; } = null!;
+
+    #region Navigations
+
+    public ICollection<DoctorPhone> Phones { get; set; } = [];
+
+    #endregion
+
+    #endregion
+}