move swift examples (#100)

* move swift examples

* swift workflow

* fixup

* rewirte gettingStarted

* add README for swift

* update fiat examples and addresss feedback

snippets/swift/BreezSDKExamples/Sources/FiatCurrencies.swift

@@ -0,0 +1,48 @@
+//
+//  FiatCurrencies.swift
+//
+//
+//  Created by ruben on 14/11/2023.
+//
+
+import Foundation
+import BreezSDK
+
+func listSupportedFiatCurrencies(sdk: BlockingBreezServices) -> [FiatCurrency]? {
+    // ANCHOR: list-fiat-currencies
+    let supportedFiatCurrencies = try? sdk.listFiatCurrencies()
+    // ANCHOR_END: list-fiat-currencies
+    return supportedFiatCurrencies
+}
+
+func getCurrentRates(sdk:BlockingBreezServices) -> [Rate]? {
+    // ANCHOR: fetch-fiat-rates
+    let fiatRates = try? sdk.fetchFiatRates()
+    // ANCHOR_END: fetch-fiat-rates
+    return fiatRates
+}
+
+func getFiatCurrencyAndRates(sdk: BlockingBreezServices) -> [(FiatCurrency,Rate)]? {
+    // ANCHOR: get-fiat-currencies-and-rates
+    var ratesMap = [String:Rate]()
+    if let supportedFiatCurrencies = try? sdk.listFiatCurrencies(), let fiatRates = try? sdk.fetchFiatRates() {
+        for fiatRate in fiatRates {
+            ratesMap[fiatRate.coin.lowercased()] = fiatRate
+        }
+        
+        let sorted = supportedFiatCurrencies.sorted(by: { f1, f2 in
+            f1.id<f2.id
+        })
+        
+        var result = [(FiatCurrency,Rate)]()
+        for currency in sorted {
+            if let rate = ratesMap[currency.id.lowercased()] {
+                result.append((currency, rate))
+            }
+            
+        }
+        return result
+    }
+    // ANCHOR_END: get-fiat-currencies-and-rates
+    return nil
+}