docs: document protected member support

[vbreuss]

This PR adds documentation for Mockolate's protected member support feature. The changes document how to set up and verify protected virtual members (methods, properties, and indexers) on class mocks using the .Protected accessor.

Key Changes:

• Added comprehensive documentation section in README.md explaining protected member setup and verification
• Created new dedicated documentation page for protected members in the advanced features section
• Updated solution file to include the new documentation files

---

• Fixes Document protected member support #417

[Copilot]

Pull request overview

This PR adds documentation for Mockolate's protected member support feature. The changes document how to set up and verify protected virtual members (methods, properties, and indexers) on class mocks using the .Protected accessor.

Changes:

• Added comprehensive documentation section in README.md explaining protected member setup and verification
• Created new dedicated documentation page for protected members in the advanced features section
• Updated solution file to include the new documentation files

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 4 comments.

File	Description
README.md	Added "Working with protected members" section with examples of setup and verification for protected methods, properties, and indexers
Mockolate.slnx	Added references to new documentation files for protected members and callback features
Docs/pages/advanced-features/01-working-with-protected-members.md	Created dedicated documentation page covering protected member functionality with detailed examples

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[github-actions]

🚀 Benchmark Results

Details

BenchmarkDotNet v0.15.8, Linux Ubuntu 24.04.3 LTS (Noble Numbat)

AMD EPYC 7763 2.71GHz, 1 CPU, 4 logical and 2 physical cores

.NET SDK 10.0.102

[Host] : .NET 10.0.2 (10.0.2, 10.0.225.61305), X64 RyuJIT x86-64-v3
Job=InProcess  Toolchain=InProcessEmitToolchain  IterationCount=15

LaunchCount=1  WarmupCount=10

Method	Mean	Error	StdDev	Gen0	Gen1	Allocated
Simple_Mockolate	1.631 μs	0.0052 μs	0.0044 μs	0.2270	-	3.73 KB
Simple_Moq	173.603 μs	0.4801 μs	0.4256 μs	0.4883	-	14.55 KB
Simple_NSubstitute	5.424 μs	0.0117 μs	0.0109 μs	0.5569	0.0076	9.14 KB
Simple_FakeItEasy	6.312 μs	0.0230 μs	0.0216 μs	0.4959	-	8.11 KB

[github-actions]

This is addressed in release v1.1.0.