Display the list of unread conversations

lib/models/unread_conversation.dart

@@ -0,0 +1,25 @@
+import 'package:flutter/material.dart';
+
+/// Unread conversation information
+///
+/// @author Pierre Hubert
+
+class UnreadConversation {
+  final int id;
+  final String convName;
+  final int lastActive;
+  final int userID;
+  final String message;
+
+  const UnreadConversation({
+    @required this.id,
+    @required this.convName,
+    @required this.lastActive,
+    @required this.userID,
+    @required this.message,
+  })  : assert(id != null),
+        assert(convName != null),
+        assert(lastActive != null),
+        assert(userID != null),
+        assert(message != null);
+}