Add A2C link

Author: simoninithomas

docs/index.html

@@ -167,6 +167,7 @@ <h1> A Free course in Deep Reinforcement Learning from beginner to expert.</h1>
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 *                      Part 1
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@@ -198,6 +199,7 @@ <h3> 📚 More ressources:  </h3>
     </ul>
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@@ -413,14 +415,14 @@ <h2>Part 5:  Advantage Actor Critic (A2C) and Asynchronous Advantage Actor Criti
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   <h3>📜 Course: </h3>
   <h3> 📅 July </h3>
-  <p>  You'll learn the <b>Actor Critic's logic and how to implement it with Tensorflow.</b> </p>
-  <!--<a href="https://medium.freecodecamp.org/diving-deeper-into-reinforcement-learning-with-q-learning-c18d0db58efe">
+  <p>  You'll learn the <b>Actor Critic's logic and how to implement an A2C agent that plays Sonic the Hedgehog with Tensorflow.</b> </p>
+ <a href="https://medium.freecodecamp.org/an-intro-to-advantage-actor-critic-methods-lets-play-sonic-the-hedgehog-86d6240171d">
               <button type="button" class="btn btn-success">Read the article
               </button>
           </a>
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     <br>
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             <a href="https://github.com/simoninithomas/Deep_reinforcement_learning_Course/tree/master/A2C%20with%20Sonic%20the%20Hedgehog">