chore: update example settings file

src/FiscalOS.API/appsettings.Example.json

@@ -14,5 +14,13 @@
     "Issuer": "Issuer",
     "Secret": "Secret",
     "ExpiryInMinutes": "ExpiryInMinutes"
+  },
+  "FileKeyRingOptions": {
+    "KeysDirectoryPath": "KeysDirectoryPath",
+    "PrimaryKeyId": "PrimaryKeyId"
+  },
+  "PlaidOptions": {
+    "ClientId": "ClientId",
+    "Secret": "Secret"
   }
 }