Added basic jumping

game.wren

@@ -59,6 +59,7 @@ class Game is Ready {
       var input = Transform.local_vector_to_world(camera, right + left, 0, fore + back)
       input.y = 0
       Math.normalize(input)
+      input.y = Input.event_began("jump", "game") ? 2 : 0
 
       Character3D.set.input(_player, input)
     }