Add reproduction instruction

benchmark/ddpg/README.md

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+# Deep Deterministic Policy Gradient Benchmark
+
+This repository contains instructions to reproduce our DDPG experiments.
+
+## Install CleanRL
+
+Prerequisites:
+* Python 3.8+
+* [Poetry](https://python-poetry.org)
+
+Install dependencies:
+
+```bash
+git clone https://github.com/vwxyzjn/cleanrl.git && cd cleanrl
+git checkout v0.6.0 # pinned master version
+poetry install
+```
+
+## Reproduce CleanRL's DDPG Benchmark
+
+Follow the commNote that you may need to overwrite the `--wandb-entity cleanrl` to your own W&B entity.
+
+```bash
+# reproduce the classic control experiments
+bash cleanrl/mujoco.sh
+```
+