[DOCS} Add alt texts to images on the first page (#1893)

README.md

@@ -95,16 +95,16 @@ If you like the project and/or used it please consider supporting it! It can be
 * [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/)
 
 ### Theengs Plug
-[![IMAGE ALT TEXT HERE](https://img.youtube.com/vi/nUwMt9p2U7o/0.jpg)](https://www.youtube.com/watch?v=nUwMt9p2U7o&t=427s)
+[![Theengs Plug video ElektroMaker](https://img.youtube.com/vi/nUwMt9p2U7o/0.jpg)](https://www.youtube.com/watch?v=nUwMt9p2U7o&t=427s)
 
 ### 433Mhz and BLE
-[![IMAGE ALT TEXT HERE](https://img.youtube.com/vi/_gdXR1uklaY/0.jpg)](https://www.youtube.com/watch?v=_gdXR1uklaY)
+[![433Mhz and BLE gateway video by Andreas Spiess](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)
+[![BLE gateway video by Andreas Spiess](https://img.youtube.com/vi/noUROhtf0E0/0.jpg)](https://www.youtube.com/watch?v=noUROhtf0E0)
 
 ### 433Mhz
-[![IMAGE ALT TEXT HERE](https://img.youtube.com/vi/H-JXWbWjJYE/0.jpg)](https://www.youtube.com/watch?v=H-JXWbWjJYE)
+[![RTL_433 video by TECH MIND](https://img.youtube.com/vi/H-JXWbWjJYE/0.jpg)](https://www.youtube.com/watch?v=H-JXWbWjJYE)
 
 ### LORA
-[![IMAGE ALT TEXT HERE](https://img.youtube.com/vi/6DftaHxDawM/0.jpg)](https://www.youtube.com/watch?v=6DftaHxDawM)
+[![LORA video by Priceless Toolkit](https://img.youtube.com/vi/6DftaHxDawM/0.jpg)](https://www.youtube.com/watch?v=6DftaHxDawM)