Auction House Design Documentation

[surenzeroonelabs]

Hi team, thanks for the hard work on designing Auction House.
This new protocol will have massive impact on Solana NFT ecosystem.

Me and my team are trying to create a marketplace. We have been
successful to list a NFT in our Auction House. Now we need to list
all the NFTs that are listed with us. There seem to be 2 options for us,

1. Make listing through our service, that way we can save the listing in our
   own db.
2. Query the blockchain using TokenGpaBuilder

Unfortunately, there isn't much documentation around Auction House design.
It would be good to know different Accounts and PDAs involved in every actions
e.g. sell, buy, bid, etc. That would help us determine whether or not we can
query NFTs that are listed against an Auction House directly in the blockchain.