Mention the simulator in the introduction

Author: PeterJCLaw

index.md

@@ -11,6 +11,7 @@ The information is spread across multiple sections:
 
 - The [kit](/docs/kit/) section will give you an overview of the physical kit that is provided to your team, how to connect to each board and what features they have.
 - The [programming](/docs/programming/) section talks through how to write code that interacts with all the boards.
+- The [simulator](/docs/simulator/) section explains how to use the simulator for testing your code, exploring strategies as well as preparing for the virtual competition.
 - The [rules](/docs/rules/) section is important as it talks through the aim of this year's game and what task you are trying to achieve.
 - [Tutorials](/docs/tutorials/) are a series of guides that will help you get started.