expand lib docs a little bit

src/lib.rs

@@ -5,7 +5,9 @@
 //! Check out the [Bevy website](https://bevyengine.org) for more information, read the 
 //! [Bevy Book](https://bevyengine.org/learn/book/introduction) for a step-by-step guide, and [engage with our
 //! community](https://bevyengine.org/community/) if you have any questions or ideas!
-//!  
+//!
+//! ## Example
+//!Here is a simple "Hello World" Bevy app:
 //! ```
 //!use bevy::prelude::*;
 //!
@@ -16,10 +18,16 @@
 //!        .run();
 //!}
 //! ```
-//!
+
+//! Don't let the simplicity of the example above fool you. Bevy is a [fully featured game engine](https://bevyengine.org/learn/book/introduction/features/)
+//! and it gets more powerful every day!
+//! 
+//! ### This Crate
 //! The "bevy" crate is just a container crate that makes it easier to consume Bevy components.
 //! The defaults provide a "full" engine experience, but you can easily enable / disable features
 //! in your project's Cargo.toml to meet your specific needs. See Bevy's Cargo.toml for a full list of features available.
+//! 
+//! If you prefer it, you can also consume the individual bevy crates directly.
 
 #![feature(min_specialization)]