added hardware board software and PC control guide

Software/sTimer.py

@@ -0,0 +1,18 @@
+from machine import Timer
+import TMC2130
+
+FREQUENCY = 100 #kHz
+
+counter = 0
+sTim = Timer()
+
+def sTim_callback(t):
+    global counter
+    counter += 1
+    TMC2130.timer_callback(counter)
+    
+def sTimer_Start():
+    sTim.init(freq=FREQUENCY*1000, mode=Timer.PERIODIC, callback=sTim_callback)
+    
+def sTimer_Stop():
+    sTim.deinit()