Add I2C driver in action image

Signed-off-by: Tisham Dhar <whatnickd@gmail.com>

Author: whatnick

README.md

@@ -1,7 +1,11 @@
-# ADE7816 SPI/I2C Arduino Driver
+# ADE7816 SPI Arduino Driver
 
 ![Arduino SPI](doc/Arduino_SPI_code.png)
 
+# ADE7816 I2C Arduino Driver
+
+![Arduino I2C](doc/Arduino_I2C_code.png)
+
 This is an Arduino Library to read ADE7816 Energy Monitor ASIC from Arduino compatible microcontrollers.
 The driver supports :
 - SPI mode for energy reading