fix: add link to Discord

Author: bartei81

README.md

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 # Rotary Controller Python
 
+![Discord](https://img.shields.io/discord/1386014070632878100?style=social&link=https%3A%2F%2Fdiscord.gg%2F69Qr5PSu)
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+
 This project is a Kivy based user interface developed for the Raspberry PI for the control of rotary tables and
 similar devices on manual milling machines, tool grinders and similar equipment.