updating README

Author: siddacious

README.rst

@@ -56,7 +56,20 @@ To install in a virtual environment in your current project:
 Usage Example
 =============
 
-.. code-block:: python
+.. code-block: python3
+    import time
+    import board
+    import busio
+    import adafruit_icm20649
+
+    i2c = busio.I2C(board.SCL, board.SDA)
+    icm =  adafruit_icm20649.ICM20649(i2c)
+
+    while True:
+        print("Acceleration: X:%.2f, Y: %.2f, Z: %.2f m/s^2"%(icm.acceleration))
+        print("Gyro X:%.2f, Y: %.2f, Z: %.2f degrees/s"%(icm.gyro))
+        print("")
+        time.sleep(0.5)
 
 Contributing
 ============