Add production Greenlight credentials example

snippets/python/src/production.py

@@ -0,0 +1,13 @@
+import breez_sdk
+
+def production_node_config():
+    # ANCHOR: moving-to-production
+    # Read your Greenlight credentials from secure storage
+    deviceKey = []
+    deviceCert = []
+    greenlightCredentials = breez_sdk.GreenlightCredentials(deviceKey, deviceCert)
+
+    node_config = breez_sdk.NodeConfig.GREENLIGHT(
+        breez_sdk.GreenlightNodeConfig(greenlightCredentials, None))
+    # ANCHOR_END: moving-to-production
+    return node_config