Updated readme

README.md

@@ -72,6 +72,12 @@ The RNode Firmware supports the following boards:
 - Homebrew RNodes based on Adafruit Feather ESP32 boards
 - Homebrew RNodes based on generic ESP32 boards
 
+<img src="Documentation/images/devboards_1.webp" width="100%"/>
+
+<center><i>What does all these devices have in common? They are all RNodes!</i></center><br/><br/>
+
+If a device or board you want to use is not yet supported, you are welcome to join the effort and help creating a board definition and pin mapping for it!
+
 ## Supported Transceiver Modules
 The RNode Firmware supports all transceiver modules based on **Semtech SX1276** or **Semtech SX1278** chips, that have an **SPI interface** and expose the **DIO_0** interrupt pin from the chip.