Explain inner workings of the plug-in in readme

Just to give people a feel of what they can expect.
Ghostkeeper · Nov 21, 2018 · d76dc5e · d76dc5e
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 # X3GWriter
 X3G output plugin for Cura. This allows saving the slice output as an X3G file for printers based on the Sailfish firmware.
 
+This plug-in takes the normal g-code output of Cura, and converts it using [GPX](https://github.com/Ghostkeeper/GPX) to the X3G format.
+
 ## Support
 X3GWriter supports Windows, MacOS and Linux.