refactoring and added comments

using_custom_fonts/lib/utils.dart

@@ -0,0 +1,14 @@
+import 'package:flutter/material.dart';
+
+TextStyle getCustomFontTextStyle() {
+  // text style which defines a custom font
+  return const TextStyle(
+      // set color of text
+      color: Colors.blueAccent,
+      // set the font family as defined in pubspec.yaml
+      fontFamily: 'Pacifico',
+      // set the font weight
+      fontWeight: FontWeight.w400,
+      // set the font size
+      fontSize: 36.0);
+}