Update README.md

Added nextflow badge with lastet tested version
Added conda badge

README.md

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 ![CoVigator logo](images/CoVigator_logo_txt_nobg.png "CoVigator logo")
 
 # CoVigator pipeline: variant detection pipeline for Sars-CoV-2
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+[![Nextflow](https://img.shields.io/badge/nextflow%20DSL2-≤23.04.0-23aa62.svg)](https://www.nextflow.io/)
+[![run with conda](http://img.shields.io/badge/run%20with-conda-3EB049?labelColor=000000&logo=anaconda)](https://docs.conda.io/en/latest/)
 [![DOI](https://zenodo.org/badge/374669617.svg)](https://zenodo.org/badge/latestdoi/374669617)
 [![Run tests](https://github.com/TRON-Bioinformatics/covigator-ngs-pipeline/actions/workflows/automated_tests.yml/badge.svg?branch=master)](https://github.com/TRON-Bioinformatics/covigator-ngs-pipeline/actions/workflows/automated_tests.yml)
 [![Powered by NumFOCUS](https://img.shields.io/badge/powered%20by-Nextflow-orange.svg?style=flat&colorA=E1523D&colorB=007D8A)](https://www.nextflow.io/)