Update README.md

Author: khoih-prog

README.md

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 ## ESP_DoubleResetDetector
 
+[![arduino-library-badge](https://www.ardu-badge.com/badge/ESP_DoubleResetDetector.svg?)](https://www.ardu-badge.com/ESP_DoubleResetDetector)
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 This library is based on, modified, bug-fixed and improved from [`DataCute`] (https://github.com/datacute/DoubleResetDetector) to add support for ESP32.
 
 Using this library to detect a double reset, using RTC Memory for ESP8266 and EEPROM for ESP32.