Document installation steps for C# LSP #2204
Description
Describe the feature or problem you'd like to solve
Document installation steps for C# LSP
Proposed solution
Add a dedicated section to the documentation covering:
- Recommended C# LSP implementation(s)
- Installation steps (e.g., via dotnet tool install, GitHub releases, etc.)
- Configuration json for Copilot CLI
- Any known limitations or compatibility notes
Example prompts or workflows
No response
Additional context
No response