add link to repo and workflow

README.md

 # Metagenomics group documentation
 
+## Metagenomics analysis
+
+A draft for a wide overview of different analysis done from sequencing reads is available [HERE](https://tess.elixir-europe.org/workflows/metagenomics). _Note that you need an account and the TeSS platform and access rights are required since the workflow is private._
+
+## Projects and repository
+
+Project | Description
+------- | -----------
+[workflow-benchmarking](https://gitlab.pasteur.fr/metagenomics/workflow-benchmarking) | Compare different workflow system (CWL, NextFlow and SnakeMake)
+
 ## Reading and Bibliography
 
 A library has been created on [Zotero](https://www.zotero.org/groups/2312155/metagenomicspasteur/items). Feel free to add new