docs: add GitHub Pages site for PureSharp

[mao2009]

Summary

Add a minimal static GitHub Pages site for PureSharp to improve discoverability in Google/Bing and provide a concise entry point for C# developers interested in referential transparency, immutability, functional programming, and Roslyn analyzers.

Added

• docs/index.html — project landing page
• docs/features.html — purity, immutable locals, FluentIf, and Roslyn workflow
• docs/diagnostics.html — RT/LVP/FIF diagnostic overview
• docs/assets/site.css — small responsive stylesheet
• docs/robots.txt
• docs/sitemap.xml

Each HTML page has a unique title, meta description, one h1, canonical URL, internal navigation, and links to GitHub. The site is static HTML/CSS only and assumes publication at https://mao2009.github.io/PureSharp/ from main /docs.

The content is based on the current README and docs/DIAGNOSTICS.md; it does not introduce new analyzer guarantees or alter runtime/analyzer behavior.

Recommended GitHub About settings

Website
https://mao2009.github.io/PureSharp/

Suggested description
C# Roslyn analyzer and library for referential transparency, immutable local variables, and safer functional-style programming.

Suggested topics
csharp, roslyn, roslyn-analyzer, functional-programming, referential-transparency, immutability, static-analysis, dotnet, code-quality, analyzer, pure-functions, fluent-api

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Run ID: 0ad497c0-73e3-44d2-8dd6-eac4f1000b19

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