This library tries to merge the variable persistence from WizardDroid into Android Material Stepper
Instead of extending from Fragment and including Step simply extend from StepFragment class
Use annotation @StepVariable for variables defined in your StepFragments or PersistingStepperLayout. Variables are automatically shared into PersistingStepperLayout and the following StepFragment upon clicking next in the stepper. Make sure to use the same name for StepVariables across different StepFragments.