Update README.md

Author: jeffe107

README.md

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 # MAGFlow
 
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+    <img src="assets/MAGFlow-logo.png" alt="MAGFlow" width="50%">
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 MAGFlow serves as pipeline to generate the input file for [BIgMAG](https://github.com/jeffe107/BIgMAG) by measuring the quality of metagenomes through multiples tools and annotating them taxonomically.
 
 [![Nextflow](https://img.shields.io/badge/nextflow%20DSL2-%E2%89%A523.04.0-23aa62.svg)](https://www.nextflow.io/)