Start implementing ggez example

examples/ggez/main.rs

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+mod renderer;
+mod widget;
+
+use renderer::Renderer;
+use widget::Text;
+
+use ggez;
+use ggez::event;
+use ggez::graphics;
+
+use iced::Interface;
+
+pub fn main() -> ggez::GameResult {
+    let cb = ggez::ContextBuilder::new("iced", "ggez");
+    let (ctx, event_loop) = &mut cb.build()?;
+    let state = &mut Game::new()?;
+    event::run(ctx, event_loop, state)
+}
+
+struct Game {}
+
+impl Game {
+    fn new() -> ggez::GameResult<Game> {
+        Ok(Game {})
+    }
+}
+
+impl event::EventHandler for Game {
+    fn update(&mut self, _ctx: &mut ggez::Context) -> ggez::GameResult {
+        Ok(())
+    }
+
+    fn draw(&mut self, context: &mut ggez::Context) -> ggez::GameResult {
+        graphics::clear(context, [0.1, 0.2, 0.3, 1.0].into());
+
+        {
+            let renderer = &mut Renderer { context };
+            let ui: Interface<(), Renderer> =
+                Interface::compute(Text::new("Hello, iced!").into(), renderer);
+
+            let mouse_cursor = ui.draw(renderer, iced::Point::new(0.0, 0.0));
+
+            renderer.flush();
+        }
+
+        graphics::present(context)?;
+        Ok(())
+    }
+}