add robot tutorial

Author: tballmsft

docs/projects/SUMMARY.md

@@ -147,6 +147,10 @@
   * [micro:bit of Things](https://sites.google.com/view/microbitofthings)
   * [ARM University - micro:course](https://github.com/arm-university/micro-course)
   * [A-Z Robotics](https://tinkerspark.teachable.com/)
+* [Robot Simulator](/microbit=robot)
+  * [Getting Started](https://github.com/microsoft/microbit-robot/blob/main/tutorials/getting-started.md)
+  * [Lights and Sounds](https://github.com/microsoft/microbit-robot/blob/main/tutorials/light-and-sound.md)
+  * [Line Follower](https://github.com/microsoft/microbit-robot/blob/main/tutorials/line-follower.md)
 * [Jacdac](/jacdac)
   * [Getting started](https://microsoft.github.io/jacdac-docs/clients/makecode/)
   * [Button smasher](https://microsoft.github.io/jacdac-docs/clients/makecode/projects/button-smasher/)