[NOT FULLY WORKING] Added frontend react native interface.

interfaces/nativeapp/src/api/calendar.ts

@@ -0,0 +1,19 @@
+import apiClient from './client';
+import { CalendarEvent } from '../types/calendar';
+
+export const getCalendarEvents = async (start?: Date, end?: Date): Promise<CalendarEvent[]> => {
+    try {
+        const params: Record<string, string> = {};
+        if (start instanceof Date) {
+            params.start = start.toISOString();
+        }
+        if (end instanceof Date) {
+            params.end = end.toISOString();
+        }
+        const response = await apiClient.get('/calendar/events', { params });
+        return response.data;
+    } catch (error) {
+        console.error("Error fetching calendar events", error);
+        throw error;
+    }
+}