Add SWH id and badge

README.md

 # studies: Org-modized study
 
 [![pipeline status](https://gitlab.inria.fr/tutorial-guix-hpc-workshop/studies/org-modized/badges/main/pipeline.svg)](https://gitlab.inria.fr/tutorial-guix-hpc-workshop/studies/org-modized/-/commits/main)
+[![SWH](https://archive.softwareheritage.org/badge/swh:1:dir:2277b3d721d80119c2508aa919b5f73bb8f1e3d7/)](https://archive.softwareheritage.org/swh:1:dir:2277b3d721d80119c2508aa919b5f73bb8f1e3d7;origin=https://gitlab.inria.fr/tutorial-guix-hpc-workshop/studies/org-modized;visit=swh:1:snp:1edce0f7f7b974994cd04c50bf83c4de2f4f7167;anchor=swh:1:rev:23d07d1980cb487cb4036238ecb72328527a82ee)
 
 This repository contains a copy of a minimal working example of an experimental
 study written following the principles of literate programming [2]. It features

study.org

@@ -70,7 +70,7 @@ dedicated git repository [fn:repo].
 
 [fn:repo] [[https://gitlab.inria.fr/tutorial-guix-workshop/studies/org-modized]],
 archived on [[https://archive.softwareheritage.org/]] under the identifier
-=TBD=.
+=swh:1:snp:1edce0f7f7b974994cd04c50bf83c4de2f4f7167=.
 
 
 ** Experimental setup