[Docs] Add badges to README

[jlizen]

Especially crates.io and docs.rs. This is nice in particular since we have so many crates, it is useful to be able to hop to them.

Sample PR: https://github.com/async-profiler/rust-agent/pull/22/files

I assume we would want just a list for the docs.rs/crates.io per crate?

[jlizen]

Whoops, wrong repo

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If you need more assistance, please either tag a team member or open a new issue that references this one.