Update README.md

Author: spacehuhn

README.md

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 # ArduinoPcap
 Create and send .pcap files using ESP8266/ESP32 and Arduino.
 
+[![Sniffing WiFi with ESP32 & ESP8266 in Wireshark](https://img.youtube.com/vi/3Ac6X6ZBQ0g/0.jpg)](https://www.youtube.com/watch?v=3Ac6X6ZBQ0g)  
+
 **Support me and my projects on [Patreon!](https://www.patreon.com/spacehuhn)**  
 [<img width="200" alt="Support me on Patreon" src="https://c5.patreon.com/external/logo/downloads_wordmark_navy.png">](https://www.patreon.com/spacehuhn)