Update examples, add css

examples/multiwindow.rs

@@ -1,3 +1,9 @@
+//! Multiwindow example
+//!
+//! This exmaple shows how to implement a simple multiwindow application using dioxus.
+//! This works by spawning a new window when the user clicks a button. We have to build a new virtualdom which has its
+//! own context, root elements, etc.
+
 use dioxus::prelude::*;
 
 fn main() {