add new image to README

Author: steffensc

README.md

@@ -45,4 +45,4 @@ Note that the green wire connected to the RXD pin of the TTL to RS485 converter
 Furthermore note that the TXD pin of this specific TTL to RS485 board has to be connected to TX pin of the ESP8266, RXD has to be connected to RX. When using other TTL to RS485 board the TX of the ESP may has to be connected to the RX pin of the TTL board and vice versa.
 
 ![Image of the used hardware](esp_ttl_rs485_xlr_hardwaresetup.jpg)
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+![Harware built into housing](artnet_node_in_housing.jpg)