Appearance
ServiceNow.Core 
SNow.Core.ServiceNow 
ServiceNow.ServiceNow(IConfiguration, JsonConverter[]) Constructor 
Your configuration must have a session named AzureAd or simples authentication data (UserName , Password and BaseAddress)
csharp
public ServiceNow(Microsoft.Extensions.Configuration.IConfiguration configuration, System.Text.Json.Serialization.JsonConverter[] customConverters=null);Parameters 
configuration Microsoft.Extensions.Configuration.IConfiguration
customConverters System.Text.Json.Serialization.JsonConverter[]