[bisq-network/growth] Add viacash as a payment method (Issue #263)

[max23hodl]

viacash is a system that allows to cash in EUR to a bank account in any of their partner stores.
There are partner stores in Germany, Spain, Italy, Austria, Greece and Switzerland.
www.viacash.com

Process:
1. Seller generates a viacash barcode using the online banking system of a bank that offers this service.

2. Seller sends this barcode to Buyer. Either as an image or as plain text. In the latter case Buyer has to generate a barcode with EAN-13 format (easy with any "barcode generator" app).

3. Buyer goes to the desired partner shop (www.viacash.com/#map) and lets the cashier scan the barcode. Buyer ist then asked to pay the agreed amount. Cash is always accepted. Some stores also allow to pay with card.

4. Buyer receives a ticket which contains the barcode number. In case anything goes wrong that is the proof that the agreed amount in fiat has been paid.

5. After some minutes, Seller can see that the code has been redeem and can mark the transaction as paid.

### Why

_Why would Bisq benefit from adding this payment method? Is is popular in a particular region? More convenient? More safe?_

Allows to pay in a safe way without giving any personal data.
Buyer can pay in cash.

### Region

_In which areas of the world can this payment method be used?_

Partner stores in Germany, Spain, Italy, Switzerland, Austria and Greece.

### Currencies

_What currencies is this payment method for?_

EUR €

### Chargeback risk

_How easy is it to cancel a payment once it's made? This is the most important characteristic of a payment method._

The payment can't be reverted once the buyer has paid the amount to the cashier at the partner store.

### Size of user base

_Do you know how many people use this payment method?_

Unkown. Offered by some bank in Europe. (N26, bunq, DKB...)

### Data requirements

_What information **must** a user provide to a counterparty to accept a payment?_

Barcode or barcode number.

### Verification

_How can payments be verified? Examples: TLSNotary is typically used for electronic payments, and receipt scans are typically used for money orders._

Seller can see in the online banking that the barcode was used and the amount received.
Buyer gets a ticket at the partner store as confirmation. The ticket contains the barcode number and can be used in case of dispute.

### Duration

_How long do payments take? Please provide a range, as the advertised best-case scenario rarely accounts for edge cases._

Time needed for buyer to go to the partner store. The transaction can be seen on the online baking within minutes. The barcode is valid for 24 hours.

### Fees

_Does it cost anything to make a transfer using this payment method? If so, how much?_

1,5%
Bank takes 1,5% of the deposited amount.

### Fraud risk

_How easy or difficult is fraud with this payment method?_

Difficult. Cashier at partner store takes payment like any other transaction at the store. If the cash is fake, the buyer can not deposit the agreed amount and the transaction is cancelled. 

### Payment amounts

_What is the minimum or maximum amount you can send with this payment method?_

Min. 50 €
Max. 999,90 €

### Payment description

_Can a note be added when sending payment with this payment method (would be useful to include the Bisq trade ID)?_

Not possible.

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