[bisq-network/projects] Prototype for offer book and create offer UX for Bisq 2.0 (Misq) (#57)

[eyalron33]

Following advice from @chimp1984, I spoke with @warddem. I would try to work with him on this from the Bisq side. We could change the original proposal to make it "official".

First, see Ward's wireframe for his current ideas [here](https://app.slack.com/client/T014JG4AV99/D021GR3KG69/thread/D021GR3KG69-1622026457.002500). In this wireframe you can
- click on an offer to open its details,
- click on "more filters" to opens advanced search options,
- click on setup offer" to start a wizard for making offers.

(we will change the text there to fit Bisq terminology later on:))

## Discussion
There are three parts to the prototype:
- Offerbook
- Making an offer
- Taking an offer

How about making designing these the first 3 small milestones for the proposals?

"Make an offer" is the easiest part (there are plenty of known good UX options for wizards). "Take an offer" might be difficult if it includes some "negotiation" between the traders.

But "Offerbook" is probably the most challenging. It needs to show much more information than a regular exchange, while still be easy to use. **So let's start with "Offerbook" as a first milestone**.

### Offerbook: one column vs. two column
A classical exchange offerbook has two columns. On one side you have people selling their Ethereum for Monero (let's say), while on the other side - people selling their Monero for Ethereum. This lets users see the "market state". 

However, two columns offerbook has two problems. One, it leaves less space in the screen for more data about each trade. Two, it's unclear how to call each column (since Bisq 2.0 won't have Bitcoin as the base currency). I personally don't feel that neither buy/sell or ask/bid is clear here, but don't have an alternative to offer.

@warddem introduced a one-column offerbook in his wireframe. You choose if you want to sell your Ethereum for Monero or vice versa - and get an offerbook for this option.

It's super clear and there is more space for extra details, but it may look more like a bulletin board than an exchange. 

However, Bisq is not a place where people make quick trades, so it may be the best option to go for.

### protocols names vs protocols properties
Since one highlight of Bisq 2.0 is in support of multiple trading protocols, we should probably show them by default in the offer book.

However, should we use protocol names? I feel that the names would really be clear only for power users. Maybe it's best to show next to each offer not the protocol name, but some property of it? Like cheap (reputation-based protocol), fast (atomic swap), secure (current trading protocol), etc.? Then we can show a name & description when people hover on this.

This is not a proposal design, but a question: do we want protocol names in the offer screen or icons/properties (cheap, fast, secure..)?

### Defaults: casual users vs. power users
The multi-protocols options is great for power users, but possibly confusing for "casual users". 

Do we assume that Bisq wants plenty of casual users? In this case, we need a default option, otherwise, they may leave by getting confused from all the trading protocols. 

More questions: 
- Do we want to show all the trading protocols options by default, or only for power users (once they enable it with some button)? 
- Do we assign to each pair a default protocol?  

### General design
@warddem stick with the current Bisq design. Do we want that? Or do we prefer a clickable demo that doesn't sit within the current design of Bisq?

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