Caching data.

[m-murad]

When the app is offline the app shows no data.
Instead, we should cache data and show it when the app is offline.

@pilhuhn @danielpassos @garg-anuj @pg301
What do you people think???

[pg301]

@m-murad Good thought! Due to inventory changes a lot of things in the app are not working fine. So we can work on this once we stabilise the app.

[KeenWarrior]

@m-murad project is a bit stable now to accept caching advices. So what are your suggestions?