Add README.md to the project

README.md

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+<h1 align="center" style="margin-top: 0px;">iap</h1>
+
+<p align="center">
+<a href="https://github.com/space-code/iap/blob/main/LICENSE"><img alt="License" src="https://img.shields.io/github/license/space-code/iap?style=flat"></a> 
+<a href="https://github.com/space-code/iap"><img alt="CI" src="https://github.com/space-code/iap/actions/workflows/ci.yml/badge.svg?branch=main"></a>
+</p>
+
+## Description
+`iap` verifies a purchase receipt via AppStore
+
+- [Usage](#usage)
+- [Communication](#communication)
+- [Contributing](#contributing)
+- [Author](#author)
+- [License](#license)
+
+## Usage
+
+```go
+package appstore
+
+// create an IAP client
+client := appstore.New()
+// create an validation request
+r := appstore.IAPValidationRequest{
+  ReceiptData:            "enter your receipt here",
+  ExcludeOldTransactions: true,
+}
+ctx := context.Background()
+var response appstore.IAPValidationResponse
+// receipt validation
+err := v.VerifyReceipt(ctx, req, &response)
+```
+
+## Communication
+- If you **found a bug**, open an issue.
+- If you **have a feature request**, open an issue.
+- If you **want to contribute**, submit a pull request.
+
+## Contributing
+Please feel free to help out with this project! If you see something that could be made better or want a new feature, open up an issue or send a Pull Request!
+
+## Author
+Nikita Vasilev, [email protected]
+
+## License
+iap is available under the MIT license. See the LICENSE file for more info.