feat: wire up stretch into place

examples/strecher.rs

@@ -0,0 +1,34 @@
+use stretch2::prelude::*;
+
+fn main() -> Result<(), Error> {
+    let mut stretch = Stretch::new();
+
+    let child = stretch.new_node(
+        Style {
+            size: Size {
+                width: Dimension::Percent(0.5),
+                height: Dimension::Auto,
+            },
+            ..Default::default()
+        },
+        &[],
+    )?;
+
+    let node = stretch.new_node(
+        Style {
+            size: Size {
+                width: Dimension::Points(100.0),
+                height: Dimension::Points(100.0),
+            },
+            justify_content: JustifyContent::Center,
+            ..Default::default()
+        },
+        &[child],
+    )?;
+
+    stretch.compute_layout(node, Size::undefined())?;
+    println!("node: {:#?}", stretch.layout(node)?);
+    println!("child: {:#?}", stretch.layout(child)?);
+
+    Ok(())
+}