add readme and explicit license

readme.md

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+# off-board Prusa Connect server for Prusa MINI
+
+Because of <https://github.com/prusa3d/Prusa-Firmware-Buddy/issues/1285>, I wanted to have the actual prusa WUI running off the printer, but still getting its data from the printer API. This little go file does the trick.
+
+Since this makes use of the GPLv3 WUI code, I hereby license this under that as well.
+
+main.js and main.css are taken from the [4.3.4 release](https://github.com/prusa3d/Prusa-Firmware-Buddy/releases/tag/v4.3.4).