docs: depreciation notice

README.md

 # mir-prepare-annotation
 
+NOTE: THIS IS AN OUTDATED VERSION OF THE ZAVOLAB MIRNA PIPELINE SUITE, IN
+WHICH EACH PIPELINE LIVES INSIDE ITS OWN REPOSITORY. GIVEN THAT THE PIPELINES
+ARE USUALLY RUN TOGETHER AND THEY SHARE A LOT OF THE SAME RESOURCES, WE HAVE
+SINCE DECIDED TO HOST ALL PIPELINES IN THE SAME (THIS!) REPOSITORY, UNDER THE
+DEFAULT BRANCH. YOU ARE STRONGLY RECOMMENDED TO USE THE NEW SETUP, AS THIS
+BRANCH AND THE OTHER REPOSITORIES ARE NOT MAINTAINED ANYMORE. NOTE THAT THIS
+PARTICULAR BRANCH WAS USED TO DEVELOP AN ADVANCED VERSION OF THE PIPELINE
+CAPABLE OF PROCESSING MICRORNA ANNOTATIONS AND PREPARING CORRESPONDING ISOMIR
+ANNOATIONS.
+
 [Snakemake] workflow for download and prepare the necessary files for smallRNA-seq related pipelines.
 
 The scheme below is a visual representation of an example run of the