Update examples, add css

examples/hello_world.rs

@@ -1,3 +1,14 @@
+//! The simplest example of a Dioxus app.
+//!
+//! In this example we:
+//! - import a number of important items from the prelude (launch, Element, rsx, div, etc.)
+//! - define a main function that calls the launch function with our app function
+//! - define an app function that returns a div element with the text "Hello, world!"
+//!
+//! The `launch` function is the entry point for all Dioxus apps. It takes a function that returns an Element. This function
+//! calls "launch" on the currently-configured renderer you have. So if the `web` feature is enabled, it will launch a web
+//! app, and if the `desktop` feature is enabled, it will launch a desktop app.
+
 use dioxus::prelude::*;
 
 fn main() {