Add basic multiplayer

backend/src/physics/containers/bounding-box-list.ts

@@ -0,0 +1,20 @@
+import { BoundingBoxBase } from '../bounds/bounding-box-base';
+
+export class BoundingBoxList {
+  constructor(private boundingBoxes: Array<BoundingBoxBase> = []) {}
+
+  public insert(box: BoundingBoxBase) {
+    this.boundingBoxes.push(box);
+  }
+
+  public remove(box: BoundingBoxBase) {
+    this.boundingBoxes.splice(
+      this.boundingBoxes.findIndex((i) => i === box),
+      1
+    );
+  }
+
+  public findIntersecting(box: BoundingBoxBase): Array<BoundingBoxBase> {
+    return this.boundingBoxes.filter((b) => b.intersects(box));
+  }
+}