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
+- Walker2d-v4
 model-index:
 - name: TD3
   results:

agent.pt

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:adaa27d1814d79fc978b91f16c785019310e7744949bb86642ea62dd9bceffb5
-size 521313
+oid sha256:336792cec4d969c55b357fb342cfc7a429ccf5ba598fd4ac7cbed57ef2973f28
+size 521357