Added egui (#3976)

* added egui

* fixed issue

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Co-authored-by: Goren Barak <[email protected]>

Author: gorentbarak

topics/egui/index.md

@@ -0,0 +1,14 @@
+---
+topic: egui
+aliases: egui-rs, egui-rust, egui_rs, egui_rust
+related: iced, iced-rs
+created_by: Emil Ernerfeldt
+display_name: egui
+github_url: https://github.com/emilk/egui/
+short_description: egui (pronounced "e-gooey") is a simple, fast, and highly portable immediate mode GUI library for Rust. egui runs on the web, natively, and in your favorite game engine. it aims to be the easiest-to-use Rust GUI library.
+---
+egui (pronounced "e-gooey") is a simple, fast, and highly portable immediate mode GUI library for Rust. egui runs on the web, natively, and in your favorite game engine.
+
+egui aims to be the easiest-to-use Rust GUI library, and the simplest way to make a web app in Rust.
+
+egui can be used anywhere you can draw textured triangles, which means you can easily integrate it into your game engine of choice.