User's dialog example for App Designer

Simple example for acquiring user input from a custom dialog box.

This contribution contains two files (.mlapp files). One is a "mother" app, calling a "dialog" app. The mother app takes an input from the dialog, and updates some lamp colors. It is a simple demo on how to acquire inputs from an app. App Designer apps do not take input arguments at the class constructor function, but an init function takes care of this, afterwards of creating the object.
Also please visit: https://se.mathworks.com/matlabcentral/answers/284140-call-an-mlapp-with-input-argument-s