Update README.md

README.md

@@ -17,6 +17,7 @@ Full documentation at http://www.rapidmixapi.com/
 We are using Catch for C++ testing. Look at the test fixtures in the /tests/test_projetc/test_project.xcodeproj for an example of how to implement them.
 
 ## Building with CMake
+Navigate to /RAPID-MIX_API and run this in a terminal:
 
 `mkdir build  
 cd build