implemented empty builder widget for game history view

lib/presentation/widgets/game_history_empty_builder.dart

@@ -0,0 +1,15 @@
+import 'package:flutter/material.dart';
+import 'package:game_tracker/presentation/widgets/game_history_listtile.dart';
+
+Widget GameHistoryEmptyBuilder(message) {
+  return Container(
+      padding: EdgeInsets.only(top:100),
+      margin: EdgeInsets.only(left: 10, right: 10),
+      alignment: Alignment.topCenter,
+      child: Text(
+        "$message", 
+        style: TextStyle(fontSize: 20),
+        textAlign: TextAlign.center,
+        )
+    );
+}