Create rustyll.md for Rustyll documentation (#1046)

Added documentation for Rustyll static site generator.

Author: matbrgz

src/site/generators/rustyll.md

@@ -0,0 +1,33 @@
+---
+title: Rustyll
+repo: betterwebinit/rustyll
+homepage: https://github.com/betterwebinit/rustyll
+language:
+  - Rust
+license:
+  - AGPL
+templates:
+  - Liquid (Jekyll-compatible)
+description: A high-performance, Jekyll-compatible static site generator built in Rust.
+twitter: matbrgz
+---
+
+Rustyll is a fast, modern, Jekyll-compatible static site generator written in Rust.  
+It was created to solve performance challenges in extremely large Jekyll projects, offering the same workflow and folder structure developers already know — but powered by Rust’s speed, safety, and parallelism.
+
+Like Jekyll, Rustyll takes Markdown, collections, front matter, and Liquid templates, then outputs a fully static website that can be deployed anywhere: Netlify, Vercel, GitHub Pages, Cloudflare Pages, or any HTTP server.
+
+### Philosophy
+
+Rustyll follows a simple principle: **keep Jekyll’s ecosystem, remove its bottlenecks**.
+
+It does not introduce unnecessary abstractions, and it avoids configuration bloat. Instead, it focuses on:
+
+- **High performance**, ideal for very large sites with tens or hundreds of thousands of pages  
+- **Maximum compatibility** with existing Jekyll conventions and Liquid templates  
+- **Zero runtime dependencies**, producing a single, portable binary  
+- **Transparency**, giving users control without magic or hidden behavior  
+
+Rustyll aims to stay out of the user’s way — just like Jekyll — while delivering the power needed for modern, large-scale static sites.
+
+Contributions are welcome as Rustyll moves toward its 1.0 release.