Add `examples` folder content to the module template

[thewtex]

See:

https://github.com/KitwareMedical/ITKMorphologicalContourInterpolation/tree/master/examples

for what the content can be like.

[jhlegarreta]

Thanks @thewtex I'll add this over the next few days !

[dzenanz]

A blocker for adding examples here is https://github.com/InsightSoftwareConsortium/ITK/issues/359. Once that is resolved, PR #46 can be revived.