add info about basic connection testing using the example script

Author: icewind1991

README.md

@@ -150,3 +150,15 @@ $share->notify('')->listen(function (\Icewind\SMB\Change $change) {
 	echo $change->getCode() . ': ' . $change->getPath() . "\n";
 });
 ```
+
+## Testing SMB
+
+Use the following steps to check if the library can connect to your SMB share.
+
+1. Clone this repository or download the source as [zip](https://github.com/icewind1991/SMB/archive/master.zip)
+2. Make sure [composer](https://getcomposer.org/) is installed
+3. Run `composer install` in the root of the repository
+4. Edit `example.php` with the relevant settings for your share.
+5. Run `php example.php`
+
+If everything works correctly then the contents of the share should be outputted.

example.php

@@ -1,16 +1,22 @@
 <?php
+
 use Icewind\SMB\NativeServer;
 use Icewind\SMB\Server;
 
 require('vendor/autoload.php');
 
+$host = 'localhost';
+$user = 'test';
+$password = 'test';
+$share = 'test';
+
 if (Server::NativeAvailable()) {
-	$server = new NativeServer('localhost', 'test', 'test');
+	$server = new NativeServer($host, $user, $password);
 } else {
-	$server = new Server('localhost', 'test', 'test');
+	$server = new Server($host, $user, $password);
 }
 
-$share = $server->getShare('test');
+$share = $server->getShare($share);
 
 $files = $share->dir('/');
 foreach ($files as $file) {