Add usethis docstyle interface

[nathanjmcdougall]

Improve the README

[codspeed-hq]

CodSpeed Performance Report

Merging #433 will not alter performance

_{Comparing 16-something-for-choosingconfiguring-a-particular-docstring-style (dd3f0a1) with main (c2210e5)}

Summary

✅ 1 untouched benchmarks

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 98.33333% with 1 line in your changes missing coverage. Please review.

Project coverage is 97.89%. Comparing base (c2210e5) to head (dd3f0a1).

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/usethis/_tool.py	96.15%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #433   +/-   ##
=======================================
  Coverage   97.89%   97.89%           
=======================================
  Files          73       75    +2     
  Lines        3461     3518   +57     
=======================================
+ Hits         3388     3444   +56     
- Misses         73       74    +1     

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