Add a README and an example

README.md

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+# ITEAD Studio 
+
+This is an experimental Arduino library for controlling two stepper motors using the ITEAD Studio dual stepper motor driver shield. 
+
+Currently limited to supporting bipolar NEMA17 motors.
+
+
+## Example
+
+```cpp
+#include "IteadDualStepperShield.h"
+
+IteadDualStepperShield mc;
+
+void setup () {
+  mc.setup();
+  mc.setSpeed(0, 2000);
+  mc.setSpeed(1, 2000);
+}
+
+void loop () {
+  mc.setDir(0, 1);
+  mc.setDir(1, 1);
+  delay(50);
+  mc.stepBoth(200); // Run stepper in one direction
+  delay(500);
+  mc.setDir(0, 0);
+  mc.setDir(1, 0);
+  delay(50);
+  mc.stepBoth(200); // Run stepper in reverse direction
+  delay(500);
+}
+```
+
+
+## Links
+
+[Banana Robotics - Dual Stepper Motor Driver Shield for Arduino](https://www.bananarobotics.com/shop/ITEAD-Dual-Stepper-Motor-Driver-Shield)
+
+[ITEAD Wiki - Arduino Dual Step Motor Driver Shield](https://wiki.iteadstudio.com/Arduino_Dual_Step_Motor_Driver_Shield)

examples/dual_steppers/dual_steppers.ino

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+#include "IteadDualStepperShield.h"
+
+IteadDualStepperShield mc;
+
+void setup () {
+  mc.setup();
+  mc.setSpeed(0, 2000);
+  mc.setSpeed(1, 2000);
+}
+
+void loop () {
+  mc.setDir(0, 1);
+  mc.setDir(1, 1);
+  delay(50);
+  mc.stepBoth(200); // Run stepper in one direction
+  delay(500);
+  mc.setDir(0, 0);
+  mc.setDir(1, 0);
+  delay(50);
+  mc.stepBoth(200); // Run stepper in reverse direction
+  delay(500);
+}