Update User Guide

guide/index.rst

@@ -7,6 +7,8 @@ HTTP Client
 Aplus Framework HTTP (HyperText Transfer Protocol) Client Library.
 
 - `Installation`_
+- `Usage`_
+- `Conclusion`_
 
 Installation
 ------------
@@ -16,3 +18,39 @@ The installation of this library can be done with Composer:
 .. code-block::
 
     composer require aplus/http-client
+
+Usage
+-----
+
+The HTTP Client library is very simple and powerful which can be used as follows:
+
+.. code-block:: php
+
+    use Framework\HTTP\Client\Client;
+    use Framework\HTTP\Client\Request;
+
+    $client = new Client();
+
+    $request = new Request('https://domain.tld/profile');
+    $request->setMethod('POST');
+    $request->setBasicAuth('johndoe', 'abc123');
+    $request->setJson(['name' => 'John Doe']);
+
+    $response = $client->run($request);
+
+    echo $response->getStatus();
+    echo $response->getBody();
+
+Conclusion
+----------
+
+Aplus HTTP Client Library is an easy-to-use tool for, beginners and experienced,
+PHP developers. 
+It is perfect for building, simple and full-featured, HTTP interactions. 
+The more you use it, the more you will learn.
+
+.. note::
+    Did you find something wrong? 
+    Be sure to let us know about it with an
+    `issue <https://gitlab.com/aplus-framework/libraries/http-client/issues>`_. 
+    Thank you!