Create empty user page

lib/utils/navigation_utils.dart

@@ -0,0 +1,21 @@
+import 'package:comunic/ui/routes/user_page_route.dart';
+import 'package:flutter/material.dart';
+import 'package:meta/meta.dart';
+
+/// Navigation utilities
+///
+/// @author Pierre HUBERT
+
+/// Open the page of a user
+void openUserPage({@required int userID, @required BuildContext context}) {
+  assert(userID != null);
+  assert(context != null);
+
+  Navigator.of(context).push(
+    MaterialPageRoute(
+      builder: (c) => UserPageRoute(
+            userID: userID,
+          ),
+    ),
+  );
+}