Codegen: Create templates for application index page

[mat-app]

Description

Create template for each ui framework(material-ui, grommet, ionic) that will be used by generator for generating application index page:

• [ ] templates/app-material-ui
• [ ] templates/app-grommet
• [ ] templates/app-ionic

Proposed solution

• look at home pages at each framework's example project and create templates from them
• [ ] there should be router, menu (ideally using one JSON - one item for the home page)
• [ ] definition of routes and menu will be in separated JSON file, so menu will iterate through JSON (something similar like in material-ui example project)
• TODO directory structure naming convention src/pages
• TODO App.tsx
• TODO what is the name for the home page?

Acceptance criteria

• [ ] GIVEN have material-ui, grommet, ionic WHEN i need to generate application for these frameworks THEN i have template for earch library that can be used by generator