feat(readme): added details and screenshot

README.md

@@ -2,17 +2,23 @@
 
 [![MIT](https://img.shields.io/badge/License-MIT-lightgrey.svg)](https://opensource.org/license/mit/)
 
-<!-- FIXME: add a screenshot -->
 <div align="center">
     <img src="screenshot.png" alt="Description" width="300"/>
 </div>
 
 ## Performance
 
-<!-- FIXME: add information -->
-- Rust
-- WASM
-- `&str` and `u8`
+🔫
+This is the fastest Sudoku game in the West!
+
+- Built with [Rust 🦀](https://rust-lang.org)
+  and [Dioxus](https://dioxuslabs.com).
+- Compiles to [Web Assembly (WASM)](https://webassembly.org/).
+- Efficient stack-allocated data structures with `&str` and `u8` everywhere.
+- Fast sudoku generation using the [`sudoku`](https://lib.rs/sudoku) crate.
+
+After seeing my mom playing her favorite game in an ad-plagued spyware in
+her mobile phone, I've built this for her.
 
 ## License