Implement a function for drawing components

gui/src/lib.rs

@@ -2,6 +2,14 @@ pub struct Screen {
     pub components: Vec<Box<dyn Draw>>,
 }
 
+impl Screen {
+    pub fn run(&self) {
+        for component in self.components.iter() {
+            component.draw();
+        }
+    }
+}
+
 pub trait Draw {
     fn draw(&self);
 }