docs: Add diagram and logo

README.md

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+[![nf-core CI](https://github.com/dalmolingroup/euryale/actions/workflows/ci.yml/badge.svg)](https://github.com/dalmolingroup/euryale/actions/workflows/ci.yml)
+[![docs](https://github.com/dalmolingroup/euryale/actions/workflows/docs.yml/badge.svg)](https://github.com/dalmolingroup/euryale/actions/workflows/docs.yml)
+
+[![Nextflow](https://img.shields.io/badge/nextflow%20DSL2-%E2%89%A522.10.1-4bc7e2a.svg?labelColor=000000)](https://www.nextflow.io/)
+[![run with docker](https://img.shields.io/badge/run%20with-docker-0db7ed?labelColor=000000&logo=docker)](https://www.docker.com/)
+[![run with singularity](https://img.shields.io/badge/run%20with-singularity-1d355c.svg?labelColor=000000)](https://sylabs.io/docs/)
+
+![EURYALE Logo](assets/euryale_logo.png)
+
 ## Introduction
 
 **dalmolingroup/euryale** is a pipeline for taxonomic classification and functional annotation of metagenomic reads. Based on [MEDUSA](https://github.com/dalmolingroup/medusa).
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 ## Pipeline summary
 
+<picture>
+
+  <source media="(prefers-color-scheme: dark)" srcset="./assets/euryale_workflow.drawio.png">
+  <img alt="EURYALE diagram" src="./assets/euryale_workflow.light.png">
+</picture>
+
 ### Pre-processing
 
 - Read QC ([`FastQC`](https://www.bioinformatics.babraham.ac.uk/projects/fastqc/))
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 ### Taxonomic classification
 
 - Sequence classification ([`Kaiju`](https://github.com/bioinformatics-centre/kaiju/))
+- (**WIP**) Sequence classification ([`Kraken2`](https://github.com/DerrickWood/kraken2))
 - Visualization ([`Krona`](https://github.com/marbl/Krona/wiki))
 
 ### Functional annotation

docs/assets/euryale_logo.png

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+../../assets/euryale_logo.png

docs/assets/euryale_workflow.drawio.png

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+../../assets/euryale_workflow.drawio.png

docs/assets/euryale_workflow.light.png

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+../../assets/euryale_workflow.light.png