[README] Improve README.

README.md

@@ -1,3 +1,21 @@
-# yui-examples
+Yui Examples
+============
 
-Yui library examples repository.
+A collection of code examples for [Yui](https://git.doublefourteen.io/lua/yui).
+
+## Contents
+
+* [Hello World](examples/helloworld.lua) -- most basic of the basics.
+* [Basic Menu](examples/basicmenu.lua) -- a simple menu made of buttons, useful for main menus and pause menus.
+* [Options Menu](examples/optionsmenu.lua) -- comprehensive example, demonstrating several widgets and interactions.
+
+...and the [initial selection](examples/init.lua) menu is a demo in itself :)
+
+## Acknowledgement
+
+Some examples use [PixelDroid Menu fonts](https://github.com/pixeldroid/fonts),
+see [ACKNOWLEDGEMENT](fonts/README.ACKNOWLEDGEMENT) for details.
+
+## License
+
+Zlib, see [LICENSE](LICENSE) for details.