Added Agent Availability screen

ac_web/lib/Pages/AgentAvailabilities.dart

@@ -0,0 +1,12 @@
+import 'package:ac_web/Widgets/AgentAvailabilityColumn.dart';
+import 'package:flutter/material.dart';
+
+/// Page that lists all agents together with their current availability.
+class AgentAvailabilities extends StatelessWidget {
+  const AgentAvailabilities({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return const AgentAvailabilityColumn();
+  }
+}