README.md:miniscript-docker serve: add screenshot

Author: RandyMcMillan

README.md

@@ -53,6 +53,9 @@ docker pull ghcr.io/bitcoincore-dev/miniscript-docker:latest
 /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/bitcoincore-dev/miniscript-docker/master/miniscript-docker)" - serve
 ```
 
+![miniscript-docker-serve](https://github.com/bitcoincore-dev/miniscript-docker/assets/152159/75a556b2-a526-4fb0-abf7-2ffb8fb0e47a)
+
+
 <hr>
 
 Go to [the Miniscript website](http://bitcoin.sipa.be/miniscript/).