Dashboard Page - Appointments:

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

frontend/Models/Appointment.cs

@@ -0,0 +1,9 @@
+namespace HealthcareManagerUiWebAssem.Models;
+
+public class Appointment
+{
+    public string Id { get; set; }
+    public string PatientId { get; set; }
+    public string DoctorId { get; set; }
+    public List<DateTime> AppointmentsList { get; set; } = [];
+}