docs(README): add example usage of main web page and /targets endpoint

README.md

@@ -11,6 +11,10 @@ Wake-on-LAN API in Node.js
 2. Edit the file and add your targets
 
 ## Usage
+Navigate to `http://localhost:9999` and just click the target you want to wake up.
+
+Or:
+
 ### POST to `/wake`
 ```bash
 curl -X POST -H "Content-Type: application/json" -d '{
@@ -23,6 +27,11 @@ curl -X POST -H "Content-Type: application/json" -d '{
 curl http://localhost:9999/wake?mac=00:AA:BB:CC:DD:EE
 ```
 
+### GET to `/targets`
+```bash
+curl http://localhost:9999/targets
+```
+
 ### GET to `/wake/:name`
 ```bash
 curl http://localhost:9999/wake/<target name>