Dashboard Page - Appointments:

- create separate dashboard components for doctor and patient
- add appointments to dashboard components
- add code to backend for appointments retrieval

frontend/Services/Appointment/IAppointmentService.cs

@@ -0,0 +1,14 @@
+using HealthcareManagerUiWebAssem.Models;
+
+namespace HealthcareManagerUiWebAssem.Services.Appointment;
+
+public interface IAppointmentService
+{
+    Task<BaseResponse> GetAppointmentsByPatient(Guid patientId);
+
+    Task<BaseResponse> GetAppointmentsByDoctor(Guid doctorId);
+
+    Task<BaseResponse> CreateAppointment(AppointmentManagementModel model);
+
+    Task<BaseResponse> DeleteAppointment(AppointmentManagementModel model);
+}