docs: adapt README to crates.io

[Razaloc]

At this moment bmap-rs and bmap-parser share the same README. This is problematic because in crates.io, once published, bmap-parser contains references to bmap-rs while if should be independent from it.

Fix the original README file. Add a new README file for bmap-parser.

Signed-off-by: Rafael Garcia Ruiz [email protected]

[Razaloc]

Just in case we want to quick fix the README problem, I've committed a bump to versions.

[obbardc]

can you drop the bors commit and the version bump commit ? We are gonna drop bors at some point, and I think we should handle the release separately.