Jewels Bank, Item Auction

[nitoygo]

Is your feature request related to a problem? Please describe.
A suggestion to add a feature where users can deposit jewels or items that can be used for trading even outside of the client.

Describe the solution you'd like
User talks to NPC to deposit jewels
User talks to NPC, deposits items for sale.
Users can buy things on the auction with the deposited jewels
Users can also open personal stores with jewels as payment, and it can use the stored jewels in the bank

Describe alternatives you've considered
Users can proceed with trading via webapp

Additional context

[DavidTs93]

I am starting to work on a jewels storage system (kinda like a jewels bank).
This will mostly be an API, just a "store the amount of every jewel in the DB" and a way to access (query/add/remove) them, but should be a good start.
For now I'm making this a plugin.