update README.md

Author: Frezyx

README.md

@@ -1,14 +1,60 @@
 # animated_icon_button
 
-Flutter package to create custom animated icons
+😊 Flutter package to create custom <strong>animated</strong> IconButton.</br>
+😵 <strong>Includes all available icons.</strong> Based on native IconButton.
+
+<img src="https://github.com/Frezyx/animated_icon_button/blob/master/example/rep_files/preview.gif?raw=true" width="270">
 
 ## Getting Started
+Follow these steps to use this library
+
+### Add dependency
+
+```yaml
+dependencies:
+  animated_icon_button: ^0.1.0 #latest version
+```
+
+### Add import package
+
+```dart
+import 'package:animated_icon_button/animated_icon_button.dart';
+```
 
-This project is a starting point for a Dart
-[package](https://flutter.dev/developing-packages/),
-a library module containing code that can be shared easily across
-multiple Flutter or Dart projects.
+### Easy to use
+Simple example of use AnimatedIconButton<br>
+Put this code in your project at an screen and learn how it works 😊
 
-For help getting started with Flutter, view our 
+```dart
+    AnimatedIconButton(
+        size: 35,
+        onPressed: () {
+          print("button with color pressed");
+        },
+        duration: Duration(milliseconds: 200),
+        endIcon: Icon(
+            Icons.close,
+                color: Colors.red,
+            ),
+        startIcon: Icon(
+            Icons.add,
+            color: Colors.purple,
+        ),
+    )
+```
+
+### Attributes
+
+<strong>size:</strong> The size of AnimatedIconButton <br>
+<strong>startIcon:</strong> The icon of the AnimatedIconButton when button is not pressed.<br>
+<strong>endIcon:</strong> The icon of the AnimatedIconButton when button is pressed. <br>
+<strong>duration:</strong> Animation time of the AnimatedIconButton. <br>
+<strong>startBackgroundColor:</strong> The background Color of the AnimatedIconButton when button is not pressed. <br>
+<strong>endBackgroundColor:</strong> The background Color of the AnimatedIconButton when button is pressed. <br>
+<strong>And all fields of the parent element:</strong> <a href="https://api.flutter.dev/flutter/material/IconButton-class.html">IconButton</a>
+<br><br>
+
+For help getting started with 😍 Flutter, view our 
 [online documentation](https://flutter.dev/docs), which offers tutorials, 
 samples, guidance on mobile development, and a full API reference.
+