Update readme.md

Author: simoninithomas

PPO with Sonic the Hedgehog/readme.md

@@ -1,12 +1,4 @@
-## How to use A2C? 📖
+# WORK IN PROGRESS: the agent is not trained yet ⚠️⚠️⚠️⚠️
+## How to use PPO? 📖
 ## If you want to understand the code
-Read the [notebook](https://github.com/simoninithomas/Deep_reinforcement_learning_Course/blob/master/A2C%20with%20Sonic%20the%20Hedgehog/How%20works%20Sonic%20A2C.ipynb)
-
-⚠️ First you need to follow Step 1 (Download Sonic the Hedgehog)
-### Watch our agent playing 👀
-- **Modify the environment**: change `env.make_train_3`with the env you want in `env= DummyVecEnv([env.make_train_3]))` in play.py
-- **See the agent playing**: run `python play.py`
-
-### Continue to train 🏃‍♂️
-⚠️ There is a big risk **of overfitting**
-- Run `python agent.py`
+Read the [notebook](https://github.com/simoninithomas/Deep_reinforcement_learning_Course/blob/master/PPO%20with%20Sonic%20the%20Hedgehog/How%20works%20Sonic%20PPO.ipynb)