ANGELOCK: Add SIM800H libraries

* Add libraries and examples about:
	- send/receive sms (GSM)
	- call
	- email (gprs)
	- bluetooth
* Issues about the serial monitor: serial.print doesn't work always
* Sometimes I was able to select the function (for example SMS) but
  after that the input about phone number doesn't work.
* Add Readme.txt with brief details