Implement web features indicators page

[d0rich]

It is planned to run frontend as Telegram Web App. Major browser surely work under the hood of telegram (JavaScript, HTML, CSS). However, there is a set of specific, that are potentially helpful for this project. And these features are not supported everywhere.

It is required to develop a page which indicates if following features are available or not in the current environment (with details if possible):

1. IndexedDB
2. WebAssembly
3. Fugu API - File System Access

This will help to understand next actions on integrating web with TON storage.