Add crate metadata for publishing

[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (prīmum@5647ada). Click here to learn what that means. The diff coverage is n/a.

@@            Coverage Diff            @@
##             prīmum       #6   +/-   ##
=========================================
  Coverage          ?   58.53%           
=========================================
  Files             ?       31           
  Lines             ?      832           
  Branches          ?        0           
=========================================
  Hits              ?      487           
  Misses            ?      345           
  Partials          ?        0           

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[Nemo157]

bors r+

[bors[bot]]

Build succeeded:

• cargo audit
• cargo clippy
• cargo hack check --feature-powerset
• cargo +nightly doc --cfg docsrs
• cargo +nightly fmt --check
• cargo test
• cargo test (stable, i686-pc-windows-msvc, windows-latest)
• cargo test (stable, i686-unknown-linux-gnu, ubuntu-latest)
• cargo test (stable, x86_64-apple-darwin, macos-latest)
• cargo test (stable, x86_64-pc-windows-msvc, windows-latest)
• cargo test (stable, x86_64-unknown-linux-gnu, ubuntu-latest)