Add README

README.md

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+cURL object wrapper.
+====================
+
+This library simply wraps PHP's native cURL extension functions with objects, for better code readability and testability.
+
+Why? We wanted to lay an object oriented foundation for [PHP.Gt/Fetch](https://php.gt/fetch), our PHP implementation of the web's fetch API that uses cURL to create asynchronous HTTP calls with promises.
+
+Example:
+
+```php
+// Native curl functions:
+$ch = curl_init();
+curl_setopt($ch, CURLOPT_URL, "https://google.com");
+curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
+$result = curl_exec($ch);
+
+// Object-wrapped alternative:
+$curl = new Curl();
+$curl->setOpt(CURLOPT_URL, "https://google.com");
+$curl->setOpt(CURLOPT_RETURNTRANSFER, true);
+$result = curl_exec();
+```