Update readme

Author: mp-se

README.md

@@ -5,6 +5,9 @@
 ![pr](https://img.shields.io/github/issues-pr/mp-se/kegmon)
 ![dev_build](https://img.shields.io/github/actions/workflow/status/mp-se/kegmon/pio-build.yaml?branch=dev)
 ![doc_build](https://img.shields.io/github/actions/workflow/status/mp-se/kegmon/doc-build.yaml?branch=master)
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 # KegMon - Monitoring the volume in your kegs