Update README.md

Author: titov-vv

README.md

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 # arduino
-_Some sketches for Arduino small devices_
+_Some sketches for Arduino IDE and small devices_
 
 ### AWS_M5_control.ino
 Subscribe to Amazon AWS IoT topic from [M5Stack](https://m5stack.com/) ESP32 device. It expects to receive message in JSON format with one 'data' floating point value: { "data" : 12.345 }. Then recevied value is printed on a screen and written to a text file on SD card.