Update esp32.md

Added link to example ESP32 platine

content/docs/box-variants/esp32.md

@@ -4,4 +4,6 @@ description: "Start and read!"
 type: page
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-Test
+The ESP32 variante is the latest version. The board should look like [this](https://github.com/toniebox-reverse-engineering/toniebox-pcb-images/blob/master/toniebox-esp32-front.jpg).
+
+![image](https://github.com/toniebox-reverse-engineering/toniebox-reverse-engineering.github.io/assets/5244525/39e0f39b-2ef5-4208-b857-a3c7ccd744f4)