finally working event system

src/main.rs

@@ -1,3 +1,15 @@
+use osui::{
+    event_manager::EventManager, extensions::keypress::KeyPressExtension, ExtensionManager, Screen,
+};
+
 fn main() {
-    
+    let mut screen = Screen::new();
+    let mut extensions = ExtensionManager::new();
+    let mut events = EventManager::new();
+
+    extensions.add(KeyPressExtension);
+
+    screen.draw("Hello, World".to_string());
+
+    screen.run(&mut events, &mut extensions).unwrap();
 }