add calendars.json file to store calendar urls and prefixes

calendars.json

@@ -0,0 +1,10 @@
+[
+    {
+        "url": "https://example.com/calendar1.ics",
+        "prefix": "Calendar 1"
+    },
+    {
+        "url": "https://example.com/calendar2.ics",
+        "prefix": "Calendar 2"
+    }
+]

server.js

@@ -97,6 +97,7 @@ app.listen(port, () => {
     console.log(`Server started on port ${port}`);
 });
 
+
 // Schedule a cron job to update the merged calendar every hour
 cron.schedule('0 * * * *', () => {
     console.log('Updating merged calendar...');