[examples,README] Include "Hello, World!" example.

README.md

@@ -9,6 +9,44 @@ for games using the [LÖVE](https://love2d.org) engine.
 Because I'm spending so much time tweaking and customizing existing libraries,
 I might as well make my own.
 
+## Hello, World!
+
+```lua
+local yui = require 'lib.yui'
+
+function love.load()
+    local w, h = 300, 80
+    local x = math.floor((love.graphics.getWidth() - w) / 2)
+    local y = math.floor((love.graphics.getHeight() - h) / 2)
+
+    ui = yui.Ui.new {
+        x = x, y = y,
+
+        yui.Rows {
+            yui.Label {
+                w = w, h = h / 2,
+                text = "Hello, World!"
+            },
+            yui.Button {
+                text = "Close",
+
+                onHit = function() love.event.quit() end
+            }
+        }
+    }
+end
+
+function love.update(dt)
+    ui:update(dt)
+end
+
+function love.draw()
+    ui:draw()
+end
+```
+
+![Hello, World!](examples/pics/hello_world.png)
+
 ## Features
 
 **Yui** fills the following gaps:
@@ -109,7 +147,7 @@ Simple User Interface Toolkit (**SUIT**) for LÖVE by Matthias Richter.
 SUIT's source code is available at: [vrld/SUIT](https://github.com/vrld/SUIT).
 SUIT is licensed under the [MIT license](https://github.com/vrld/suit/blob/master/license.txt).
 
-Widgets offered by **yui** are also inspired by **SUIT**.
+Widgets offered by **yui** and basic theme are also mostly taken from **SUIT**.
 
 See [ACKNOWLEDGEMENT](README.ACKNOWLEDGEMENT) for full SUIT license
 information and copyright notice.