Add `agent.pt` and tag the environment

This commit adds a model that is compatible with the 🥇 [Open RL Leaderboard](https://huggingface.co/spaces/open-rl-leaderboard/leaderboard) 🥇.

README.md

@@ -5,6 +5,7 @@ tags:
 - deep-reinforcement-learning
 - reinforcement-learning
 - stable-baselines3
+- Humanoid-v4
 model-index:
 - name: TRPO
   results:

agent.pt

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:cd83810309733a48f2be52b2175b469e3ce6dcb9540b965ebc7278b97cbfae46
-size 122406
+oid sha256:32e87594b3740d6d83731201cbea1d22259ed9320a38f82399ddbe24b3d67039
+size 129418