add flutter_icon_data.dart

lib/flutter_icon_data.dart

@@ -0,0 +1,10 @@
+import 'package:flutter/material.dart';
+class FlutterIconData extends IconData {
+  const FlutterIconData(int codePoint,String fontFamily)
+      : super(
+      codePoint,
+      fontFamily:fontFamily,
+      fontPackage: "flutter_icons"
+  );
+  const FlutterIconData.ionicons(int codePoint):super(codePoint,fontFamily: "Ionicons",fontPackage: "flutter_icons");
+}