🎉 add discord badge

Author: jvdd

README.md

@@ -12,6 +12,7 @@
 [![PRs Welcome](https://img.shields.io/badge/PRs-welcome-brightgreen.svg?)](http://makeapullrequest.com)
 [![Testing](https://github.com/predict-idlab/plotly-resampler/actions/workflows/test.yml/badge.svg)](https://github.com/predict-idlab/plotly-resampler/actions/workflows/test.yml)
 [![Documentation](https://img.shields.io/badge/read%20our%20docs!-informational)](https://predict-idlab.github.io/plotly-resampler/latest)
+[![Discord](https://img.shields.io/badge/Discord-%235865F2.svg?logo=discord&logoColor=white)](https://discord.gg/k2d59GrxPX)
 
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