Add [short descriptions here](http://guides.codepath.com/android/Constructing-View-Layouts#overview) with separate page to expand for ConstraintLayout - FlexBoxLayout: - https://blog.devcenter.co/unboxing-the-flexboxlayout-a7cfd125f023 - https://github.com/google/flexbox-layout - ConstraintLayout - https://developer.android.com/training/constraint-layout/index.html - https://codelabs.developers.google.com/codelabs/constraint-layout/index.html - http://tools.android.com/recent/constraintlayout10isnowavailable
