Avoid confusion about env registration

README.md

@@ -73,9 +73,11 @@ Finally, we provide a simple implementations of DQN in `dqn.py` and online actor
 MinAtar is fully compatible with [Gymnasium](https://gymnasium.farama.org/).
 A Gymnasium environment can be constructed as follows:
 ```python
+import minatar
 import gymnasium as gym
+minatar.register_envs()  # register MinAtar envs with gymnasium
 env = gym.make('MinAtar/<game-id>')
-````
+```
 The following game IDs are available: Asterix-v0, Breakout-v0, Freeway-v0, Seaquest-v0, SpaceInvaders-v0, Asterix-v1, Breakout-v1, Freeway-v1, Seaquest-v1, SpaceInvaders-v1.  
 For each game, in the v0 versions the action set has all 6 available actions (some of which are equivalent to no-op depending on the game),
 while in the v1 versions the action set is reduced to just the minimal actions for each game.  
@@ -100,7 +102,9 @@ env.close_display()
 ```
 or, if you're using the gym interface:
 ```python
+import minatar
 import gymnasium as gym
+minatar.register_envs()
 env = gym.make('MinAtar/Breakout-v1')
 env.game.display_state(50)
 # train, do steps, ...

minatar/__init__.py

@@ -1 +1,2 @@
-from .environment import Environment
+from .environment import Environment
+from .gym import register_envs