Add linx-client in API documentation

templates/API.html

@@ -11,6 +11,9 @@
 
 			<h2>API</h2>
 
+			<h3>Client</h3>
+			<p>To simplify uploading and deleting files, you can use <a target="_blank" href="https://github.com/andreimarcu/linx-client">linx-client</a>, which uses this API.</p>
+
 			{% if using_auth %}
 			<h3>Keys</h3>
 			<p>This instance uses API Keys, therefore you will need to provide a key for uploading and deleting files.<br/> To do so, add the <code>Linx-Api-Key</code> header with your key.</p>