Add rich example

examples/rich.rs

@@ -0,0 +1,28 @@
+use cursive::view::{Resizable, SizeConstraint};
+use cursive::views::{DummyView, Panel, LinearLayout, TextView, Button};
+use cursive::{Cursive, CursiveExt};
+use cursive_aligned_view::Alignable;
+
+fn main() {
+    let mut siv = Cursive::default();
+
+    let left = Panel::new(DummyView).title("Left panel");
+    let bottom = Panel::new(DummyView).title("Bottom panel");
+    let right_top = Panel::new(DummyView).title("Right top panel");
+    let right_bottom = Panel::new(
+        LinearLayout::vertical()
+            .child(TextView::new("Press this button to quit"))
+            .child(Button::new("Quit", |s| s.quit()))
+            .align_center()
+            .resized(SizeConstraint::Free, SizeConstraint::Free)
+        ).title("Right bottom panel");
+
+    let layout = LinearLayout::vertical().child(
+        LinearLayout::horizontal().child(left).child(
+            LinearLayout::vertical().child(right_top).child(right_bottom)
+        )
+    ).child(bottom);
+
+    siv.add_fullscreen_layer(layout);
+    siv.run();
+}