App Tour/On-boarding Component

[tcampbPPU]

In this PR I also did some clean up...

• Added eslint and prettier along with some IDE/VSCode configurations.
• Reorganized src/ folder to have more structured layout for future development of component and composables
• Updated Readme
• Cleaned up development playground environment

So most of the files changes where due to some minor linting stuff and of file movement, the main files you can checkout to view this feature are the following:

• src
  • components
    • src/components/AppTour.vue
    • src/components/AppTourStep.vue
  • composables
    • src/composables/useAppTour.ts
  • types
    • src/types/tour.d.ts
  • index.ts
  • typings.ts
• playground
  • playground/src/components/tour.vue