added examples

Author: 256dpi

README.md

@@ -16,6 +16,7 @@ The following examples show how you can use the library with various Arduino com
 - [Arduino WiFi Shield](https://github.com/256dpi/arduino-mqtt/blob/master/examples/ArduinoWiFiShield/ArduinoWiFiShield.ino)
 - [Adafruit HUZZAH ESP8266](https://github.com/256dpi/arduino-mqtt/blob/master/examples/AdafruitHuzzahESP8266/AdafruitHuzzahESP8266.ino) ([SSL](https://github.com/256dpi/arduino-mqtt/blob/master/examples/AdafruitHuzzahESP8266_SSL/AdafruitHuzzahESP8266_SSL.ino))
 - [Arduino/Genuino WiFi101 Shield](https://github.com/256dpi/arduino-mqtt/blob/master/examples/ArduinoWiFi101/ArduinoWiFi101.ino) ([SSL](https://github.com/256dpi/arduino-mqtt/blob/master/examples/ArduinoWiFi101_SSL/ArduinoWiFi101_SSL.ino))
+- [Arduino MKR GSM 1400](https://github.com/256dpi/arduino-mqtt/blob/master/examples/ArduinoMKRGSM1400/ArduinoMKRGSM1400.ino) ([SSL](https://github.com/256dpi/arduino-mqtt/blob/master/examples/ArduinoMKRGSM1400_SSL/ArduinoMKRGSM1400_SSL.ino))
 - [ESP32 Development Board](https://github.com/256dpi/arduino-mqtt/blob/master/examples/ESP32DevelopmentBoard/ESP32DevelopmentBoard.ino) ([SSL](https://github.com/256dpi/arduino-mqtt/blob/master/examples/ESP32DevelopmentBoard_SSL/ESP32DevelopmentBoard_SSL.ino))
 
 Other shields and boards should also work if they provide a [Client](https://www.arduino.cc/en/Reference/ClientConstructor) based network implementation.