Convert SatsPrice to a Skip multiplatform app

Sources/SatsPrice/Network/FakePriceFetcher.swift

@@ -0,0 +1,20 @@
+// This is free software: you can redistribute and/or modify it
+// under the terms of the GNU General Public License 3.0
+// as published by the Free Software Foundation https://fsf.org
+//
+//  FakePriceFetcher.swift
+//  SatsPrice
+//
+//  Created by Terry Yiu on 2/21/24.
+//
+
+#if DEBUG
+import Foundation
+
+/// Fake price fetcher that returns a randomized price. Useful for development testing without requiring a network call.
+class FakePriceFetcher: PriceFetcher {
+    func btcToUsd() async throws -> Decimal? {
+        Decimal(Double.random(in: 10000...100000))
+    }
+}
+#endif