added main.py and some informations

README.md

@@ -1 +1,2 @@
-Questo e il file di test
+usa nix-shell rshell per upload file con `cp main.py /pyboard`
+per invece usare lo shell di micropython nix-shell minicom

main.py

@@ -0,0 +1,10 @@
+from machine import Pin, Timer
+
+led = Pin("LED", Pin.OUT)
+tim = Timer()
+def tick(timer):
+    global led
+    led.toggle()
+    
+tim.init(freq=2.5, mode=Timer.PERIODIC, callback=tick)
+