Merge branch 'hmenager-master-patch-65068' into 'master'

First draft for a workflow index description file

See merge request !1

.workflow-index.yml

+language: Nextflow
+name: JASS analysis pipeline
+description: pipeline to harmonize, impute and analyze jointly GWAS summary statistics
+url: https://gitlab.pasteur.fr/statistical-genetics/jass_suite_pipeline/
+categories: [GWAS, Statistics, Genetics]
+authors:
+  - firstname: Hanna
+    lastname: Julienne
+    email: hanna.julienne@pasteur.fr