add basic game classes

server/game/room/world/body.js

@@ -0,0 +1,9 @@
+'use strict';
+
+class Body {
+	constructor() {
+		
+	}
+}
+
+module.exports = Body;

server/game/room/world/index.js

@@ -0,0 +1,35 @@
+'use strict';
+
+const Ship = require('./ship.js');
+
+class World {
+	constructor() {
+		this.box2d = false;
+		this.bodies = new Set();
+		this.structures = new Set();
+		this.asteroids = new Set();
+		this.ships = new Map();
+		this.players = new Set();
+	}
+
+	addPlayer(player) {
+		this.players.add(player);
+		this.ships.set(player, new Ship(player));
+	}
+
+	removePlayer(player) {
+		removeBody(player.ship);
+		this.ships.delete(player);
+		this.players.delete(player);
+	}
+
+	removeBody(body) {
+		// Remove from Box2d.
+	}
+
+	tick() {
+
+	}
+}
+
+module.exports = World;

server/game/room/world/ship.js

@@ -0,0 +1,13 @@
+'use strict';
+
+const Body = require('./body.js');
+
+class Ship extends Body {
+	constructor(player) {
+		super();
+		
+		this.player = player;
+	}
+}
+
+module.exports = Ship;