update the README.md and pubspec.yaml

Author: rdnasim

README.md

@@ -12,26 +12,95 @@
 
 [![Pub](https://img.shields.io/pub/v/flutter_bkash.svg)](https://pub.dartlang.org/packages/flutter_bkash)
 [![License](https://img.shields.io/badge/License-BSD_3--Clause-blue.svg)](https://opensource.org/licenses/BSD-3-Clause)
+[![PRs Welcome](https://img.shields.io/badge/PRs-welcome-brightgreen.svg)]()  [![Maintenance](https://img.shields.io/badge/Maintained%3F-yes-green.svg)]() 
+[![Open Source Love svg1](https://badges.frapsoft.com/os/v1/open-source.svg?v=103)](https://github.com/ellerbrock/open-source-badges/)
 
-This is a Flutter package for [bKash](https://www.bkash.com/) BD Payment Gateway. This package can be used in flutter project. We created this package while working for a project and thought to made it release for all so that it helps. 
+This is a Flutter package for [bKash](https://www.bkash.com/) BD Payment Gateway. This package can be used in flutter project. We created this package while working for a project and thought to made it release for all so that it helps.
 
-## Features
+## How to use:
 
-List what your package can do. Maybe include images, gifs, or videos.
+Depend on it, Run this command With Flutter:
 
-## Getting started
+```
+$ flutter pub add flutter_bkash
+```
 
-List prerequisites and provide or point to information on how to
-start using the package.
+This will add a line like this to your package's `pubspec.yaml` (and run an implicit **`flutter pub get`**):
 
-## Usage
+```
+dependencies:
+    flutter_bkash: ^0.1.0
+```
+
+Alternatively, your editor might support flutter pub get. Check the docs for your editor to learn more.
+Import it
+
+Now in your Dart code, you can use:
 
-Include short and useful examples for package users. Add longer examples
-to `/example` folder.
+`
+import 'package:flutter_bkash/flutter_bkash.dart';
+`
+
+## Usage
+examples for see the `/example` folder.
 
+**Here is the example code**
+```
+    BkashPayment(  
+      // amount of your bkash payment  
+      amount: '20',  
+      // intent would be (sale / authorization)  
+      intent: 'sale',  
+      // accessToken: '', // if the user have own access token for verify payment  
+      // currency: 'BDT', // bkash url for create payment, when you implement on you project then it be change as your production create url  createBKashUrl: 'https://merchantserver.sandbox.bka.sh/api/checkout/v1.2.0-beta/payment/create',  
+      // bkash url for execute payment, , when you implement on you project then it be change as your production create url  
+      executeBKashUrl: 'https://merchantserver.sandbox.bka.sh/api/checkout/v1.2.0-beta/payment/execute',  
+      // for script url, when you implement on production the set it live script js  
+      scriptUrl: 'https://scripts.sandbox.bka.sh/versions/1.2.0-beta/checkout/bKash-checkout-sandbox.js',  
+      
+      // the return value from the package  
+      // status => 'paymentSuccess', 'paymentFailed', 'paymentError', 'paymentClose' // data => return value of response  paymentStatus: (status, data) {  
+      dev.log('return status => $status');  
+      dev.log('return data => $data');
 
-## Additional information
+      // when payment success  
+      if (status == 'paymentSuccess') {  
+        if (data['transactionStatus'] == 'Completed') {  
+             Style.basicToast('Payment Success');  
+          }  
+      }  
+      
+      // when payment failed  
+      else if (status == 'paymentFailed') {  
+        if (data.isEmpty) {  
+            Style.errorToast('Payment Failed');  
+          } else if (data[0]['errorMessage'].toString() != 'null'){  
+            Style.errorToast("Payment Failed ${data[0]['errorMessage']}");  
+          } else {  
+            Style.errorToast("Payment Failed");  
+          }  
+      }  
+      
+      // when payment on error  
+      else if (status == 'paymentError') {  
+        Style.errorToast(jsonDecode(data['responseText'])['error']);  
+        }  
+      
+      // when payment close on demand closed the windows  
+      else if (status == 'paymentClose') {  
+        if (data == 'closedWindow') {  
+            Style.errorToast('Failed to payment, closed screen');  
+          } else if (data == 'scriptLoadedFailed') {  
+            Style.errorToast('Payment screen loading failed');  
+          }  
+      }  
+      // back to screen to pop()  
+      Navigator.of(context).pop();  
+      },  
+    )
+```
 
-Tell users more about the package: where to find more information, how to
-contribute to the package, how to file issues, what response they can expect
-from the package authors, and more.
+### Importance Notes
+- Read the comments in the example of code
+- **intent** - it would be 'sale' or 'authorization'
+- Payment status return as 'paymentSuccess', 'paymentFailed', 'paymentError', 'paymentClose', find on this keyword of the payment status, then you get the data of response on specific status.

pubspec.yaml

@@ -1,5 +1,5 @@
 name: flutter_bkash
-description: Flutter package for payment gateway bKash (Bangladesh). # TODO: Description length is between 60 to 180 characters.
+description: Flutter package for payment gateway service bKash (Bangladesh). bKash payment easy to implement through this package on your flutter project. # TODO: Description length is between 60 to 180 characters.
 version: 0.1.0
 homepage: https://github.com/codeboxrcodehub/flutter-bkash