Добавил модели данных

Medical/MedicalDatabaseContracts/AbstractModel.cs

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+namespace MedicalDatabaseContracts
+{
+    public class AbstractModel
+    {
+        public int Id { get; set; }
+    }
+}

Medical/MedicalDatabaseContracts/AbstractPersonModel.cs

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+namespace MedicalDatabaseContracts
+{
+    public class AbstractPersonModel : AbstractModel
+    {
+        public string Name { get; set; } = string.Empty;
+        public string Surname { get; set; } = string.Empty;
+        public string? Patronymic { get; set; }
+        public string PhoneNumber { get; set; } = string.Empty;
+    }
+}

Medical/MedicalDatabaseContracts/Models/Diagnose.cs

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+namespace MedicalDatabaseContracts.Models
+{
+    public class Diagnose : AbstractModel
+    {
+        public string Name { get; set; } = string.Empty;
+    }
+}

Medical/MedicalDatabaseContracts/Models/Doctor.cs

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+namespace MedicalDatabaseContracts.Models
+{
+    public class Doctor : AbstractPersonModel
+    {
+        public int SpecializationId { get; set; }
+    }
+}

Medical/MedicalDatabaseContracts/Models/Patient.cs

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+namespace MedicalDatabaseContracts.Models
+{
+    public class Patient : AbstractPersonModel
+    {
+        public char Gender { get; set; }
+        public DateOnly Birthday { get; set; }
+        public int Weight { get; set; }
+        public int Height { get; set; }
+    }
+}

Medical/MedicalDatabaseContracts/Models/Specialization.cs

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+namespace MedicalDatabaseContracts.Models
+{
+    public class Specialization : AbstractModel
+    {
+        public string Name { get; set; } = string.Empty;
+        public bool IsPediatric { get; set; }
+        public bool IsTherapeutic { get; set; }
+    }
+}

Medical/MedicalDatabaseContracts/Models/Visit.cs

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+namespace MedicalDatabaseContracts.Models
+{
+    public class Visit : AbstractModel
+    {
+        public int PatientId { get; set; }
+        public int DoctorId { get; set; }
+        public int DiagnoseId { get; set; }
+        public string? Comment { get; set; }
+    }
+}