[DOCS] Add video link and fix existing one (#1486)

README.md

@@ -78,6 +78,9 @@ If you like the project and/or used it please consider supporting it! It can be
 * [Using low-cost wireless sensors in the unlicensed bands](https://lwn.net/Articles/921497/)
 * [SMART PLUG ESP32 OPENMQTTGATEWAY SERVING AS AN BLE MQTT GATEWAY AND A POWER METER](https://www.electronics-lab.com/smart-plug-esp32-openmqttgateway-serving-as-an-ble-mqtt-gateway-and-a-power-meter/)
 
+### 433Mhz and BLE
+[![IMAGE ALT TEXT HERE](https://img.youtube.com/vi/_gdXR1uklaY/0.jpg)](https://www.youtube.com/watch?v=_gdXR1uklaY)
+
 ### BLE
 [![IMAGE ALT TEXT HERE](https://img.youtube.com/vi/noUROhtf0E0/0.jpg)](https://www.youtube.com/watch?v=noUROhtf0E0)