Merge pull request #2 from ujanssen/patch-1

Fix typo in exercise-0.md

Author: jaboehri

exercises/exercise-0.md

@@ -1,6 +1,6 @@
 [Prerequisites](prerequisites.md) • **Exercise 0** • [Exercise 1](exercise-1.md) • [Exercise 1.1](exercise-1-1.md) • [Exercise 2](exercise-2.md) • [Exercise 3](exercise-3.md) • [Exercise 4](exercise-4.md) • [Exercise 5](exercise-5.md) • [Exercise 6](exercise-6.md)
 ___
-# Exercise 1 - Setting Up The Project
+# Exercise 0 - Setting Up The Project
 Before you start working on any exercises, you should verify that you meet the requirements outlined in [prerequisites](prerequisites.md) by successfully building and deploying a plugin.  
 For this, you should follow these steps:  
 1. Checkout the branch `solutions/exercise-1`