Updated Compatible boards (markdown)

Compatible-boards.md

@@ -46,3 +46,9 @@ Require LoRa module pinout definitions in `config.h`:
    #define LORA_RST              14
    #define LORA_IRQ              26
    ```
+
+# Solder pad configuration
+- ESP-WROOM32 38pin
+![alt text](https://raw.githubusercontent.com/sh123/esp32_loraprs/master/images/esp32_38pin.png)
+![alt text](https://raw.githubusercontent.com/sh123/esp32_loraprs/master/images/solder_pads_38pin.png)
+