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: TD3
   results:

agent.pt

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:20727483b359d3f78358a01d15301bc471cccf6188347d6dfe702fd8fe373e1b
-size 1108961
+oid sha256:7f7a761b91a1910a56fa956b7be34dff9b5385d810b9abd7bf5cf98aab1dfd83
+size 1109005