feat: added clap for level parsing

- Camera sets up as a child of player entity

src/layout/systems.rs

@@ -6,7 +6,7 @@ use bevy::{
 use bevy_rapier2d::prelude::*;
 
 use crate::{
-    player::Player,
+    StartupArgs, player::Player
 };
 
 use super::*;
@@ -86,7 +86,8 @@ pub fn lock_door(
 pub fn setup_world(
     mut commands: Commands,
     asset_server: Res<AssetServer>,
+    startup_args: Res<StartupArgs>,
 ) {
-    let level_handle = asset_server.load("levels/level.toml");
+    let level_handle = asset_server.load(startup_args.level.clone());
     commands.insert_resource(LevelAssetHandle(level_handle));
 }