add readme

commands, pinout

readme.md

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+# commands
+
+- ON => start
+- OFF => stop
+- DIRR => Inkrements left
+- DIRL => Inkrements right
+- CNT => returns current position
+- IMPXXX => set Impulses davor muss DIRX angegeben werden
+
+# pinout (Arduino nano)
+- D8 (channel 1)
+- D2 (channel 2)
+- VIN (powersupply for Arduino)
+- GND (GND for Arduino)