Add demo for `ConstraintLayout` feature minimum dimensions

[noorejannat]

Minimum dimensions on ConstraintLayout

You can define minimum and maximum sizes for the ConstraintLayout itself:

android:minWidth set the minimum width for the layout
android:minHeight set the minimum height for the layout
android:maxWidth set the maximum width for the layout
android:maxHeight set the maximum height for the layout
Those minimum and maximum dimensions will be used by ConstraintLayout when its dimensions are set to WRAP_CONTENT.

[hossain-khan]

Duplicate of #54