Create activity file for justgoofin

Author: jumainfomagnus

_slides/10-justgoofin.md

@@ -0,0 +1,9 @@
+---
+layout: slide
+title: "Welcome to our slide deck!"
+---
+
+Caption here
+
+![Mardigrastocat](https://octodex.github.com/images/Mardigrastocat.png)
+{: .center}