Setup basic game application

src/main.rs

@@ -1,5 +1,12 @@
+mod components;
+mod systems;
+
 use bevy::prelude::*;
+use systems::*;
 
 fn main() {
-    App::build().run();
+    App::build()
+        .add_startup_system(add_player.system())
+        .add_system(greet_player.system())
+        .run();
 }