Add badges in Readme

README.md

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 #  twin4build: A python package for Data-driven and Ontology-based modeling and simulation of buildings
 
-[![unittest](https://github.com/JBjoernskov/Twin4Build/actions/workflows/unittest.yml/badge.svg?branch=main)](https://github.com/JBjoernskov/Twin4Build/actions/workflows/unittest.yml)
+[![ubuntu-py3.7](https://github.com/JBjoernskov/Twin4Build/actions/workflows/ub-py3-7.yml/badge.svg?branch=main)](https://github.com/JBjoernskov/Twin4Build/actions/workflows/ub-py3-7.yml)
+[![ubuntu-py3.8](https://github.com/JBjoernskov/Twin4Build/actions/workflows/ub-py3-8.yml/badge.svg?branch=main)](https://github.com/JBjoernskov/Twin4Build/actions/workflows/ub-py3-8.yml)
+[![ubuntu-py3.9](https://github.com/JBjoernskov/Twin4Build/actions/workflows/ub-py3-9.yml/badge.svg?branch=main)](https://github.com/JBjoernskov/Twin4Build/actions/workflows/ub-py3-9.yml)
+[![ubuntu-py3.10](https://github.com/JBjoernskov/Twin4Build/actions/workflows/ub-py3-10.yml/badge.svg?branch=main)](https://github.com/JBjoernskov/Twin4Build/actions/workflows/ub-py3-10.yml)
+[![ubuntu-py3.11](https://github.com/JBjoernskov/Twin4Build/actions/workflows/ub-py3-11.yml/badge.svg?branch=main)](https://github.com/JBjoernskov/Twin4Build/actions/workflows/ub-py3-11.yml)
 
 twin4build is a python package which aims to provide a flexible and automated framework for dynamic modelling of indoor climate and energy consumption in buildings. It leverages the [SAREF core](https://saref.etsi.org/core/) ontology and its extensions [SAREF4BLDG](https://saref.etsi.org/saref4bldg/) and [SAREF4SYST](https://saref.etsi.org/saref4syst/).