isn/appsettings.Development.json

{
  "Nuget": {
    "ExternalUrl" : "<http://localhost:5000/packages",
    "PackagesRootDir" : "packages",
    "MaxUserKeyCount": 5
  },
  "Smtp": {
    "Server": "localhost",
    "Port": 25,
    "SenderName": "Paul Schneider",
    "SenderEmail": "paul@pschneider.fr"
  }
}