added file for proposed architecture

includes proposed file structure and links to
resources (how to write a library and communicating
with computing)
prototype of script to communicate with arduino

assumes:
    - python 2.7, pyserial are available
    - the arduino is attached to the computer
added _prep_request function to python code

goal of this function is to clarify when requests
will be made to the arduino.  This means the arduino
will wait for the python script to ask for data and then
read sensor data.
corresponding changes to the arduino code

follows the suit of the python script.  In the
main loop it waits until a 'get' or 'post' is
needed and then the arduino will respond accordingly
(response not implemented)