Setup persistence and periodic syncing workflow

[amandesai01]

During runtime, setup periodic syncing CRON in web level, which calls Sync method.

At pkg:core level, storage mode and env will be provided during instantiation so sync method can take decisions accordingly.

During instantiation, figure out what adapter is required, take in necessary details from user (eg decrypt key if importing on web, file path if running on desktop and so on). sync method uses this to carry on.

For now, web and desktop are to be done.

• Web
• Desktop