Platform io update: add CI build of library and examples for both ESP8266 and ESP32 #30

Job	Run time
esp8266 (examples/simpleServer/simpleServer.ino)	1m 5s
esp32 (examples/simpleServer/simpleServer.ino)	54s
esp8266 (examples/customOptions/customOptions.ino)	1m 12s
esp32 (examples/customOptions/customOptions.ino)	41s
esp8266 (examples/customHTML/customHTML.ino)	45s
esp32 (examples/customHTML/customHTML.ino)	29s
esp8266 (examples/gpio_list/gpio_list.ino)	1m 6s
esp32 (examples/gpio_list/gpio_list.ino)	42s
esp8266 (examples/handleFormData/handleFormData.ino)	1m 4s
esp32 (examples/handleFormData/handleFormData.ino)	41s
esp8266 (examples/highcharts/highcharts.ino)	1m 8s
esp32 (examples/highcharts/highcharts.ino)	41s
esp8266 (examples/remoteOTA/remoteOTA.ino)	1m 16s
esp32 (examples/remoteOTA/remoteOTA.ino)	43s
esp32 (examples/withWebSocket/withWebSocket.ino)	58s
esp8266 (examples/withWebSocket/withWebSocket.ino)	1m 18s
esp32 (examples/esp32-cam/esp32-cam.ino)	50s
	15m 33s

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