Add movement

src/main.rs

 struct Player {
     position: Point,
     sprite: Rect,
+    speed: i32,
 }
 
 fn render(canvas: &mut WindowCanvas, 
     let texture_creator = canvas.texture_creator();
     let texture = texture_creator.load_texture("assets/bardo.png")?;
 
-    let player = Player {
+    let mut player = Player {
         position: Point::new(0,0),
         sprite: Rect::new(0, 0, 26, 36),
+        speed: 5,
     };
 
     let mut event_pump = sdl_context.event_pump()?;
                 Event::KeyDown { keycode: Some(Keycode::Escape), .. } => {
                     break 'running;
                 },
+                Event::KeyDown { keycode: Some(Keycode::Left), .. } => {
+                    player.position = player.position.offset(-player.speed, 0);
+                },
+                Event::KeyDown { keycode: Some(Keycode::Right), .. } => {
+                    player.position = player.position.offset(player.speed, 0);
+                },
+                Event::KeyDown { keycode: Some(Keycode::Up), .. } => {
+                    player.position = player.position.offset(0, -player.speed);
+                },
+                Event::KeyDown { keycode: Some(Keycode::Down), .. } => {
+                    player.position = player.position.offset(0, player.speed);
+                },
                 _ => {}
             }
         }