📝 added README

README.md

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+# HTTP Auth Wrapper
+Library provides simple HTTP authentication
+
+# Installation
+Just download and include classes from `src` or
+use Composer:
+
+`composer require mikechip/php-httpauth`
+
+# Sample use
+```php
+    require_once('vendor/autoload.php');
+
+    $auth = new Mike4ip\HttpAuth();
+    $auth->addLogin('admin', 'test');
+    $auth->addLogin('foo', 'bar');
+    $auth->requireAuth();
+
+    print('This is your hidden page');
+```
+
+# Customization
+```php
+    require_once('vendor/autoload.php');
+
+    /*
+     * HTTP Auth with customization
+     */
+    $auth = new Mike4ip\HttpAuth();
+    $auth->setRealm('Pass login and password');
+
+    // Set unauthorized callback
+    $auth->onUnauthorized(function() {
+        print("<h1>403 Forbidden</h1>");
+        die;
+    })->setCheckFunction(function($user, $pwd) {
+        // List of logins => passwords
+        $users = [
+        'admin' => 'test',
+        'foo' => 'bar'
+        ];
+
+        // Returns true if login and password matches
+        return (isset($users[$user]) && $users[$user] === $pwd);
+    })->requireAuth();
+
+    print('This is your hidden page');
+```
+
+# Feedback
+Use **Issues** to contact me