Revised README.md to contain a list of the active RFCs.

Added a table-of-contents in the hopes that will ease navigation: the
document now starts off with the active list after the introduction,
so I anticipate that one will not see as much of the expository text
as one used to, and thus the table of contents will help someone who
is skimming to find their objective.
Update RFC Process document with procedure one follows with new dir layout.