Add Imposter mocking library to Testing section

[themidnightgospel]

This PR adds Imposter to the Testing section.

Imposter is a compile-time mocking library for .NET that:

• Uses source generators to create strongly-typed mocks at compile time
• Targets high performance and low allocations during test runs

Summary by CodeRabbit

• Documentation
  • Updated Testing section with a new library entry including reference documentation link.

[coderabbitai]

Walkthrough

Added Imposter library entry to the Testing section of README.md with its corresponding URL. This is a documentation-only update with no functional code changes or modifications to public APIs.

Changes

Cohort / File(s)	Summary
Documentation Updates README.md	Added Imposter library entry to the Testing section with URL reference

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 A rabbit hops through docs so bright,
Adding Imposter to the Testing light,
One simple line, one link so true,
Library friends, now tried and new! ✨

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and accurately summarizes the main change: adding the Imposter mocking library to the Testing section of the README.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[coderabbitai]

Actionable comments posted: 0

🧹 Nitpick comments (1)

README.md (1)

756-756: Entry is properly formatted and positioned.

The Imposter library entry is correctly placed in the Testing section with proper alphabetical ordering between GenFu and LightBDD. Formatting matches existing entries. The GitHub URL is valid.

Consider whether the description could mention that Imposter is a compile-time mocking library (using source generators), as this is its key differentiator from other mocking libraries in the list. The current description "The Fastest and Most Memory-Efficient Mocking Library" is generic and could apply to other entries. However, the brevity is consistent with other entries in the Testing section, so this is optional.

📜 Review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between d25db57 and c9923fa.

📒 Files selected for processing (1)

• README.md (1 hunks)