docs: Main README updates

Overhaul and update the main README for the package to list all
applications supported and the details of each application at their
current state. Most time was spent on updating/aligning the use of JSON
based configuration since support for YAML configs has been deprecated
and will eventually be removed entirely.

Signed-off-by: Matthew Barth <msbarth@us.ibm.com>
Change-Id: Ifc8409261b2f50a77d47ffba46e41f25e3cf2c6c
2 files changed