getting started dapp doesn't demonstrate quid-pro-quo asset exchange

[dckc]

One of the main distinctions of our platform is the primitive is not "send A assets to X" but rather "offer A in exchange for B". The default getting started app, the fungible faucet, doesn't exhibit this pattern.

In Nov 16 office hours I went over a sell1 contract where Alice sells an item to Bob in exchange for a price.

It's pretty close to our simple exchange example contract, but I think it's simpler in useful ways.

@Tyrosine22 showed some interest in building a dapp UI around this "Alice sells an item to Bob" scenario.

[dckc]

@Tyrosine22 points out we have one, thought it needs some love: https://github.com/Agoric/dapp-simple-exchange

[dckc]

looks like @samsiegart gave https://github.com/Agoric/dapp-card-store a little polish and I gather that's a candidate for addressing this issue. Seems plausible.

[dckc]

fixed in #790 . yay!