Update README.md

Author: ChargilyDev

README.md

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 # chargily-epay-flutter
 Flutter Package for Chargily ePay Gateway
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+![Chargily ePay Gateway](https://raw.githubusercontent.com/Chargily/epay-gateway-php/main/assets/banner-1544x500.png "Chargily ePay Gateway")
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+This Plugin is to integrate ePayment gateway with Chargily easily.
+- Currently support payment by **CIB / EDAHABIA** cards and soon by **Visa / Mastercard** 
+- This repo is recently created for **Flutter Package**, If you are a developer and want to collaborate to the development of this package, you are welcomed!
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+# Contribution tips
+1. Make a fork of this repo.
+2. Take a tour to our [API documentation here](https://dev.chargily.com/docs/#/epay_integration_via_api)
+3. Get your API Key/Secret from [ePay by Chargily](https://epay.chargily.com.dz) dashboard for free.
+4. Start developing.
+5. Finished? Push and merge.