Create a lightweight PWA - 1st POC

[salboaie]

1st PoC:

• first screen with some instructions and a big button "Scan 2dmatrix"
• start the scanner from the first page
• detect the current language from browser and try to get the leaflet in the current language
• get the html from the server
  • if possible get the html
  • otherwise get the list o available languages
• display a way for user to select a language
• display the leaflet

Success conditions: load in under 1 second

Subtasks:

• prepare HTML, JS, CSS (no dependencies) - 3 screens + popup html
• add http parameter in lealfet-web-api
• use gtin-resolver to generate html
• connect pieces

[salboaie]

Decided in the Wednesday meeting that the loading time should be under 1 second, the leaflet landing depends on the network

[kpratihast]

As per @adiganga2002 / @salboaie , In the Lightweight PWA:

1. "verified" badge will not be displayed for now since anti-counterfeiting functionality is not integrated
2. The prompt to download native app will not be displayed since the native apps are yet to be published in App Store / Play Store