docs: expand clang-tools-manager/README

[2bndy5]

resolves #351

• adds badges
• adds simple CLI info (with example and copied --help output)

Summary by CodeRabbit

• Documentation
  • Expanded README documentation with comprehensive usage guide, including multiple installation methods (cargo install with bin feature, cargo-binstall, and pre-built binaries) and detailed CLI options reference
  • Updated project badges across documentation to include crates.io, docs.rs, and changelog references
  • Enhanced documentation structure with proper reference link definitions

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.84%. Comparing base (9c54ee6) to head (1c286d7).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #366   +/-   ##
=======================================
  Coverage   92.84%   92.84%           
=======================================
  Files          23       23           
  Lines        3464     3464           
=======================================
  Hits         3216     3216           
  Misses        248      248           

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: bb258d02-41f2-4ff9-b6f8-c8d71f8e419a

📥 Commits

Reviewing files that changed from the base of the PR and between 790bc1d and 1c286d7.

📒 Files selected for processing (2)

• clang-tools-manager/README.md
• cpp-linter/README.md

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Walkthrough

Two README files are updated. clang-tools-manager/README.md is expanded from a minimal description into a full usage document with crates.io/changelog badges, cargo install and cargo-binstall instructions, git checkout guidance, and a rendered clang-tools --help CLI reference. cpp-linter/README.md replaces its badge block with crates.io, docs.rs, and CHANGELOG badges and updates reference link definitions.

Changes

README Documentation Updates

Layer / File(s)	Summary
clang-tools-manager README: badges, install, and CLI docs clang-tools-manager/README.md	Adds crates.io and changelog badges, expands introductory text, documents cargo install (with --features bin) and cargo-binstall install paths, includes a "run from git clone" section, and adds a CLI section with the full clang-tools --help output and an example install command. Reference link definitions for badges are added at the bottom.
cpp-linter README: badge replacement and reference links cpp-linter/README.md	Replaces the existing badge block with crates.io, docs.rs, and CHANGELOG badges, adds corresponding reference link definitions, and removes the obsolete [pypi-org] reference.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• cpp-linter/cpp-linter-rs#337: Modifies the same clang-tools-manager/README.md as part of the clang-installer→clang-tools-manager rename, making it a direct predecessor to this README expansion.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main change: expanding the clang-tools-manager README documentation with badges and CLI information.
Linked Issues check	✅ Passed	The pull request addresses issue #351 by expanding the README with installation instructions (cargo-binstall and cargo install) and CLI documentation with help output.
Out of Scope Changes check	✅ Passed	All changes are in-scope: clang-tools-manager README expanded with documentation, and cpp-linter README updated with matching badge styles.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch clang-tools-readme

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