make serial monitor go-gettable

Author: soypat

README.md

@@ -36,4 +36,10 @@ You now have tinygo running on your Arduino!
 
 ```console
 tinygo flash -target=arduino -port=/dev/ttyUSB0 .
+```
+
+## Install the serial monitor
+
+```shell
+go get -u github.com/soypat/tinygo-arduino-examples/monitor
 ```

serial_monitor/README.md renamed to monitor/README.md

@@ -1,4 +1,4 @@
-module monitor
+module github.com/soypat/tinygo-arduino-examples/monitor
 
 go 1.16