-add arduino compatibility

[Hoog-V]

This pr adds arduino compatibilty (import as .zip functionality).

Besides this a basic usage example was added.

Code to reproduce:

#include <CayenneLPP.h>

/* The buffer size to initialize the CayenneLPP instance with */
#define BUFFER_SIZE 100

/* The measurement channel from which the measurements were measured
 * Both the data and measurement channel will be bundled and sent over LoraWAN
 * See the README of CayenneLPP
 */
#define GPS_MEASUREMENT_CHANNEL 1

void setup() {
  /* Nothing here :) */
}

void loop() {
  CayenneLPP CayenneEncoder(100);
  CayenneEncoder.addGPS(GPS_MEASUREMENT_CHANNEL, 10.0, 50.0, 20.0);
  CayenneEncoder.addGPS(GPS_MEASUREMENT_CHANNEL, 10.0, 5.0, 20.0);
}

#include <CayenneLPP.hpp>

/* The buffer size to initialize the CayenneLPP instance with */
#define BUFFER_SIZE 100

/* The measurement channel from which the measurements were measured
 * Both the data and measurement channel will be bundled and sent over LoraWAN
 * See the README of CayenneLPP
 */
#define MEASUREMENT_CHANNEL 1

void setup() {
/* Nothing here :) */
}

void loop() {
/* Statically Initialize the CayenneLPP encoder with 100 bytes buffer */
CayenneLPP::CayenneLPP<BUFFER_SIZE> CayenneEncoder;
CayenneLPP::Measurement_t GPSMeasurement = CayenneLPP::SetGPS(10.0, 50.0, 20.0);
CayenneEncoder.setMeasurement(MEASUREMENT_CHANNEL, GPSMeasurement);
GPSMeasurement = CayenneLPP::SetGPS(5.0, 50.0, 20.0);
CayenneEncoder.setMeasurement(MEASUREMENT_CHANNEL, GPSMeasurement);
}

The benefits in flash and ram are:

Type	Flash	Ram
orig	4914 Bytes	159 Bytes
Our version	3888 Bytes	149 Bytes