Added Libz Blitz crates to "additions" whitelist
Added Libz Blitz crates to "additions" whitelist

There are two sections:
- Libz Blitz crates that have passed review or are in progress
- crates that are in TODO list but already available in rust-cookbook

Full Libz Blitz TODO list is available under:
https://public.etherpad-mozilla.org/p/rust-crate-list

integer32llc/rust-playground,integer32llc/rust-playground,integer32llc/rust-playground,integer32llc/rust-playground,integer32llc/rust-playground