[INTERNAL] sap.ui.core.sample.ViewTemplate.scenario: added files

For explaining the scenario Main.controller.js should be contained. For
completeness also Main.view.xml added

Change-Id: Ia471334f1edf0d4a77ceef9377eb6e2ccee3586f
Merge "[INTERNAL] sap.ui.core.sample.ViewTemplate.scenario: added files"