Add tinkerspark to list of courses (#1735)

docs/courses.md

@@ -47,6 +47,7 @@ Tutorials, lessons, and mini-courses about programming and computing.
   "imageUrl": "https://i.ytimg.com/vi/kaNtg1HGXbY/hqdefault.jpg"
 }]
 ```
+
 ## Experimenting
 
 Fun project courses - make and experiment while learning about science and programming.
@@ -72,9 +73,14 @@ Fun project courses - make and experiment while learning about science and progr
   "description": "A hands-on course about the micro:bit and what you can do with it.",
   "url":"https://sites.google.com/view/microbitofthings",
   "imageUrl": "/static/courses/microbit-of-things.jpg"
+}, {
+  "name": "A-Z Robotics",
+  "description": "Absolute beginner's guide to learning coding, electronics and robotics on the micro:bit",
+  "url":"https://tinkerspark.teachable.com/",
+  "imageUrl": "/static/courses/tinkerspark.jpg"
 }]
 ```
 
 ## See Also
 
-[Intro to CS](/courses/csintro)
+[Intro to CS](/courses/csintro)