Added some dartdocs

Signed-off-by: Hans Kokx <hans.d.kokx@gmail.com>

packages/wolf_3d_dart/lib/wolf_3d_entities.dart

@@ -1,6 +1,13 @@
-/// Support for doing something awesome.
+/// Main entry point for all entity-related functionalities in the Wolf3D project.
 ///
-/// More dartdocs go here.
+/// This library exports various entity types, including:
+/// - Enemies (e.g., [Guard], [Mutant], [HansGrosse])
+/// - Weapons (e.g., [Pistol], [MachineGun])
+/// - Collectibles (e.g., [Ammo])
+/// - Doors ([Door])
+/// - Decorative elements ([Decorative], [DeadGuard])
+///
+/// It also provides access to the [EntityRegistry] for managing entities.
 library;
 
 export 'src/entities/entities/collectible.dart';