feat: Add basic client and first basic endpoint

Adds the client with first basic authentication and
the first endpoint `repositories` with first method.

Classes/Client.php

@@ -0,0 +1,112 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Avency\Gitea;
+
+use Avency\Gitea\Endpoint\EndpointInterface;
+use Avency\Gitea\Endpoint\Repositories;
+use Exception;
+use Psr\Http\Message\ResponseInterface;
+
+/**
+ * Gitea Client
+ */
+class Client
+{
+    const AUTH_ACCESS_TOKEN = 'access_token';
+    const AUTH_TOKEN = 'token';
+    const AUTH_BASIC_AUTH = 'basic_auth';
+
+    /**
+     * @var \GuzzleHttp\Client
+     */
+    protected $httpClient;
+
+    /**
+     * @var array
+     */
+    protected $config;
+
+    /**
+     * @param $baseUri
+     * @param $authentication
+     * @throws Exception
+     */
+    public function __construct($baseUri, $authentication)
+    {
+        $this->config = [
+            'base_uri' => $baseUri
+        ];
+
+        $this->auth($authentication);
+
+        $this->httpClient = new \GuzzleHttp\Client($this->config);
+    }
+
+    /**
+     * @param string $api
+     * @return EndpointInterface
+     * @throws Exception
+     */
+    public function api(string $api): EndpointInterface
+    {
+        switch ($api) {
+            case 'repositories':
+                return new Repositories($this);
+        }
+
+        throw new Exception('Endpoint not found', 1579246217);
+    }
+
+    /**
+     * @param string $uri
+     * @param string $method
+     * @param array $options
+     * @return ResponseInterface
+     */
+    public function request(string $uri = '', string $method = 'GET', array $options = []): ResponseInterface
+    {
+        return $this->httpClient->request($method, $uri, $options);
+    }
+
+    /**
+     * @param array $authentication
+     * @throws Exception
+     */
+    protected function auth(array $authentication)
+    {
+        if (empty($authentication['type'])) {
+            throw new Exception('Please add an authentication type.', 1579244392);
+        }
+
+        switch ($authentication['type']) {
+            case self::AUTH_ACCESS_TOKEN:
+                if (empty($authentication['auth'])) {
+                    throw new Exception('Please add the access token.', 1579245994);
+                }
+
+                $this->config['query']['access_token'] = $authentication['auth'];
+                break;
+
+            case self::AUTH_BASIC_AUTH:
+                if (empty($authentication['auth']['username'])) {
+                    throw new Exception('Please add the username.', 1579246033);
+                }
+                if (empty($authentication['auth']['password'])) {
+                    throw new Exception('Please add the password.', 1579246035);
+                }
+
+                $this->config['auth'] = [$authentication['auth']['username'], $authentication['auth']['password']];
+                break;
+
+            case self::AUTH_TOKEN:
+                if (empty($authentication['auth'])) {
+                    throw new Exception('Please add the token.', 1579246003);
+                }
+
+                $this->config['query']['token'] = $authentication['auth'];
+                break;
+        }
+    }
+}