adding readme

README.md

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+# Arduino/ATmega328 C++ Template
+This template is a base for creating Arduino projects on the ATmega328 without using the Arduino IDE. 
+Personally, I prefer to use the Arduino Eclipse IDE (http://eclipse.baeyens.it/) for ATmega328 development.
+The biggest advantage for me is the pin mapping in atmega_pins.h. In my development, I generally will 
+develop without the actual Arduino board. As the mapping on the ATmega328 is different than the Arduino
+mapping it simplifies my workflow.
+
+If you want an example of ATmega328 development without the Arduino board, take a look at this reference.
+https://www.arduino.cc/en/Main/Standalone