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:aa18c1ab65c5c2cc03119a3729ab4fba9e8426e2478d6ec4aade50ee45257c6e
-size 122406
+oid sha256:d511a22f5e23cabcfac6318904b2afa6ccc71694feb0f871adab6f7d622f9d11
+size 129418