Explained pan PMC archival

Author: mindthegab

archive/pan-pmcs-material-discontinued/README.md

@@ -0,0 +1,4 @@
+FINOS used to have a [now deprecated](https://github.com/finos/community/issues/31) federated governance based on the construct of Programs, 
+groups of projects independently managed by PMCs (Program Management Committees). 
+
+Historical information is stored in this folder for transparency purposes.