add test UI to control arduino from Android

To confirm how to send command from Android to arduino,
I added 2 button on Android UI. By pressing the button,
Android send a byte to arduino. Arduino respond and change LED
state based on the command.

Please connect LED as below
  D2 --- LED --- GND
  D3 --- LED --- GND
add Python script as simple web access application

add Python code (weather_light.py). This is a simple application to
get Tokyo weather forecast.