add Pavan's design

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
add PacBio data in README

Link: https://github.com/GeneAssembly/biosal/issues/591
Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
add assemblathon 2 datasets to public data documentation

Link: https://github.com/GeneAssembly/biosal/issues/579
Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>