adds readme and changelog

Author: filecage

CHANGELOG.md

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+# Changelog
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [0.1.0] - 2022-12-28
+- Initial release

README.md

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+# urimanage
+A library to parse, format and modify URIs following the [PSR-7 URI interface](https://www.php-fig.org/psr/psr-7/])
+
+## Installation
+Install via [composer](https://getcomposer.org):
+```
+composer require urimanage/urimanage
+```
+
+## Simple Usage
+```php
+$uri = new \UriManage\Uri('https://github.com/filecage/urimanage');
+
+echo $uri->getScheme();  // https
+echo $uri->getHost();    // github.com
+echo $uri->getPath();    // /filecage/urimanage
+echo $uri->isAbsolute(); // true
+```
+
+## Full API Reference
+For a full reference of all available methods supported by PSR-7, please
+[see here](https://github.com/php-fig/http-message/blob/efd67d1dc14a7ef4fc4e518e7dee91c271d524e4/docs/PSR7-Interfaces.md#psrhttpmessageuriinterface-methods).