Add production Greenlight credentials example

snippets/swift/BreezSDKExamples/Sources/Production.swift

@@ -0,0 +1,21 @@
+//
+//  Production.swift
+//  
+//
+//  Created by dangeross on 29/11/2023.
+//
+
+import BreezSDK
+
+func productionNodeConfig() -> NodeConfig {
+    // ANCHOR: moving-to-production
+    // Read your Greenlight credentials from secure storage
+    let deviceKey = [UInt8]()
+    let deviceCert = [UInt8]()
+    let greenlightCredentials = GreenlightCredentials(deviceKey: deviceKey, deviceCert: deviceCert)
+
+    let nodeConfig = NodeConfig.greenlight(
+            config: GreenlightNodeConfig(partnerCredentials: greenlightCredentials, inviteCode: nil))
+    // ANCHOR_END: moving-to-production
+    return nodeConfig
+}