feat: appointment list in ldp

assignment/src/main/java/appointmentplanner/AppointmentImpl.java

@@ -0,0 +1,30 @@
+package appointmentplanner;
+
+import java.time.Instant;
+
+import appointmentplanner.api.Appointment;
+import appointmentplanner.api.AppointmentRequest;
+
+public class AppointmentImpl implements Appointment {
+
+  private Instant start;
+  private Instant stop;
+
+  private AppointmentRequest request;
+
+  @Override
+  public Instant start() {
+    return start;
+  }
+
+  @Override
+  public Instant end() {
+    return stop;
+  }
+
+  @Override
+  public AppointmentRequest request() {
+    return request;
+  }
+
+}

assignment/src/main/java/appointmentplanner/LocalDayPlanImpl.java

@@ -14,9 +14,13 @@ import appointmentplanner.api.LocalDay;
 import appointmentplanner.api.LocalDayPlan;
 import appointmentplanner.api.TimePreference;
 import appointmentplanner.api.TimeSlot;
+import appointmentplanner.customlist.CustomLinkedListImpl;
+import appointmentplanner.customlist.api.CustomLinkedList;
 
 public class LocalDayPlanImpl implements LocalDayPlan {
 
+  private CustomLinkedList<AppointmentImpl> timeline = new CustomLinkedListImpl<>();
+
   public LocalDayPlanImpl(LocalDay day, Instant start, Instant end) {
     this.day = day;
     this.start = start;