Initial revision of the CDI exercise
Initial revision of the CDI exercise

ddoa/dea-code-examples,StenKoning/dea-code-examples,StenKoning/dea-code-examples,ddoa/dea-code-examples,StenKoning/dea-code-examples,ddoa/dea-code-examples,StenKoning/dea-code-examples,ddoa/dea-code-examples