minor changes

README.md

@@ -7,3 +7,16 @@ The functionalities correspond to state of the art technologies, which are didac
 publish/subscribe network
 
 ### usage
+
+```Arduino
+didacticPSNetClient psnClient;
+
+psnClient.begin(stream, callback);
+psnClient.handleNetwork();
+psnClient.subscribe(topic);
+psnClient.unsubscribe(topic);
+psnClient.publish(topic);
+
+didacticPSNetBroker psnBroker;
+psnBroker.begin(stream, callback);
+psnBroker.handleNetwork();