Adds a link to the WebSerial upload tool

Readme.md

@@ -20,6 +20,10 @@ The source code is organized as a [PlatformIO][platformio] project and is theref
 
 <img src="assets/switch-pio-env.png" width="492" height="330" alt="Switch PlatformIO project environment">
 
+## Run the applications on your ESPboy
+
+You can try out the applications without compiling them by uploading the precompiled binaries to your ESPboy. To do this, you need to connect the handheld to your PC with a USB cable. Then [go to this page][binaries] with the **Chrome** browser (the only browser currently supported).
+
 
 [espboy]:     https://www.espboy.com/
 [platformio]: https://platformio.org/