Add PPO example to README

README.md

@@ -138,6 +138,44 @@ env.close()
 
 Objectives takes either strings of the name of predefined objectives, or lambda functions which take an observation and return a scalar reward. Final rewards are (weighted) summed across all objectives. `info['objectives']` contains all objectives and their values.
 
+You can e.g. train an PPO agent using the [sb3](https://github.com/DLR-RM/stable-baselines3) implementation:
+```python
+from nucon.rl import NuconEnv
+from stable_baselines3 import PPO
+
+env = NuconEnv(objectives=['max_power'], seconds_per_step=5)
+
+# Create the PPO (Proximal Policy Optimization) model
+model = PPO(
+    "MlpPolicy", 
+    env, 
+    verbose=1,
+    learning_rate=3e-4,  # You can adjust hyperparameters as needed
+    n_steps=2048, 
+    batch_size=64, 
+    n_epochs=10, 
+    gamma=0.99, 
+    gae_lambda=0.95, 
+    clip_range=0.2, 
+    ent_coef=0.01
+)
+
+# Train the model
+model.learn(total_timesteps=100000)  # Adjust total_timesteps as needed
+
+# Test the trained model
+obs, info = env.reset()
+for _ in range(1000):
+    action, _states = model.predict(obs, deterministic=True)
+    obs, reward, terminated, truncated, info = env.step(action)
+
+    if terminated or truncated:
+        obs, info = env.reset()
+
+# Close the environment
+env.close()
+```
+
 But theres a problem: RL algorithms require a huge amount of training steps to get passable policies, and Nucleares is a very slow simulation and can not be trivially parallelized. That's why NuCon also provides a
 
 ## Simulator (Work in Progress)