added prototyping-exercises.md

posts/prototyping-exercises.md

+**ITPDP** 08-04-2019 - Magnus Sten Andersen, 201609827; Sigurd Dalsgaard Pedersen, 201804767; Frederik Ølgaard Jensen, 201808548; Asger Jark Kappel, 201809488.
+
+# Prototyping exercises
+In this design blog post we present our results from working with the exercises in class.
+
+# Sow a Button, Knit a Sensor
+![Button](/images/button.gif)
+![Ball](/images/ball.gif)
+![Stretch](/images/pull.gif)
\ No newline at end of file