Added the catalogue models and seed to support phase 2 of the POC prototype in the Persistence package.

Packages/Persistence/Sources/Internal/Seeds/Seed.swift

@@ -5,6 +5,12 @@ enum Seed {
 
     // MARK: Constants
 
+    /// The demo accounts: the buyer the stubbed passkey signs in, then a seller.
+    static let accounts: [(email: String, displayName: String)] = [
+        ("mara.v@example.com", "Mara Visser"),
+        ("joost@kestrelrow.example", "Joost de Wit"),
+    ]
+
     /// The demo listings, newest first.
     static let listings: [Listing] = [
         single(