Add sync example
Add sync example

blynkkk/blynk-library,blynkkk/blynk-library,ivankravets/blynk-library,blynkkk/blynk-library,ivankravets/blynk-library,ivankravets/blynk-library,blynkkk/blynk-library,blynkkk/blynk-library,ivankravets/blynk-library,ivankravets/blynk-library