Adds a note re setup help (#128)

* Adds a not re setup help

Co-authored-by: Kimberly Meechan <24316371+K-Meech@users.noreply.github.com>

---------

Co-authored-by: Kimberly Meechan <24316371+K-Meech@users.noreply.github.com>

Author: thompson318

learners/setup.md

@@ -2,6 +2,8 @@
 title: Setup
 ---
 
+Please attempt the steps below before attending the course. However, if you would prefer to work through this with an instructor's help, you can join the drop-in session at the start of the first day of the course. 
+
 ## Download Data
 
 During these lessons we will be using two microscopy images and creating images