Make AtClient API more 'fluent'

[gkc]

Is your feature request related to a problem? Please describe.
A more fluent API would be really useful for users in cutting down boilerplate and improving readability - e.g. share(value).with(atSign/s).as(keyName)

Describe the solution you'd like
Add fluent API a fluid share(....)

[ksanty]

@gkc should we move this to high priority to work in PR43/44?

[gkc]

No