Move new demos into this repo

[XavierChanth]

Is your feature request related to a problem? Please describe.

N/A

Describe the solution you'd like

• Create a packages folder
• Move at_lorawan into the folder
• Move at_talk into the folder

Describe alternatives you've considered

No response

Additional context

@JeremyTubongbanua I know you are doing some work in this repo, so keep in mind that we will introduce a packages/ folder...

Although should we call it packages?
One one hand it doesn't really make sense... they aren't going to be published packages.
On the other, we should be consistent with the other repos.
@gkc @cpswan thoughts?

[JeremyTubongbanua]

I would say no, since we don't have plan to have any other folders in the repo (like tests, tools, etc,.)

But we do that in at_widgets