secrets: Resolve Linux library dep. issues; add repo and README

[traeok]

What It Does

• Resolves issues w/ Linux library dependencies
• Adds a repo link and README to Secrets package

Review Checklist
I certify that I have:

• tested my changes
• added/updated automated tests
• updated the changelog
• followed the contribution guidelines

Additional Comments

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (a41278e) 83.16% compared to head (1c79cb0) 83.16%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #230   +/-   ##
=======================================
  Coverage   83.16%   83.16%           
=======================================
  Files          34       34           
  Lines        2067     2067           
=======================================
  Hits         1719     1719           
  Misses        348      348           

Flag	Coverage Δ
unittests	83.16% <ø> (ø)

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[zFernand0]

LGTM! 😋
Thanks (@t1m0thyj) for helping me understand the project.toml properties added here 😋