Add readme

Author: sunkan

README.md

@@ -0,0 +1,82 @@
+# JSONPointer
+
+[![Build Status](https://github.com/stefna/json-pointer/actions/workflows/continuous-integration.yml/badge.svg?branch=main)](https://github.com/stefna/di/actions/workflows/continuous-integration.yml)
+[![Latest Version on Packagist](https://img.shields.io/packagist/v/stefna/di.svg)](https://packagist.org/packages/stefna/di)
+[![Software License](https://img.shields.io/github/license/stefna/di.svg)](LICENSE)
+
+JSON Pointer implementation
+
+Inspired by https://github.com/gamringer/JSONPointer
+
+## Requirements
+
+PHP 8.2 or higher.
+
+## Installation
+
+```
+composer require stefna/json-pointer
+```
+
+# Usage
+
+## Test if document has pointer
+
+```php
+
+$document = [
+	"foo" => ["bar", "baz"],
+	"qux" => "quux"
+];
+
+$document = new \JsonPointer\BasicDocument('test', $document);
+
+var_dump($document->has('/foo'));
+
+var_dump($document->has('/foo/bar'));
+
+/* Results:
+
+bool(true)
+bool(false)
+
+*/
+```
+
+## Retrieving value form document
+
+```php
+
+$document = [
+	"foo" => ["bar", "baz"],
+	"qux" => "quux"
+];
+
+$document = new \JsonPointer\BasicDocument('test', $document);
+
+var_dump($document->get('/foo'));
+
+var_dump($document->get('/foo/bar'));
+/* Result
+
+array(2) {
+  [0] =>
+  string(3) "bar"
+  [1] =>
+  string(3) "baz"
+}
+
+Throws JSONPointer\Exceptions\Reference - Referenced element does not exist: bar 
+
+*/
+```
+
+
+## Contribute
+
+We are always happy to receive bug/security reports and bug/security fixes
+
+## License
+
+The MIT License (MIT). Please see [License File](LICENSE.md) for more information.
+