PWA

[nagy-nabil]

• [x] added web manifest
• [x] add service worker to cache any assets(document, images, icons, scripts) gonna use cache first then internet strategy for assets, and internet only for getting dynamic data like API calls
• [ ] add offline page
• [x] trigger update with every push(because we serve any html/css/js from the cache so we need mechanism to inform the client that their cache is out dated)