var resourceGroup = new ResourceGroup("DemoResourceGroup", new ResourceGroupArgs
{
    ResourceGroupName = "DemoRg",
    Location = "japaneast",
    Tags = {
        ["CreatedBy"] = "Pulumi",
        ["Scope"] = "Demo"
    }
});

//
// Config namespace: Xxx
//
var config = new Config("Xxx");

var resourceGroupName = config.Require("ResourceGroupNameKey");
var resourceGroupLocation = config.Require("ResourceGroupLocationKey");
var resourceGroupTags = config.RequireObject<Dictionary<string, string>>("ResourceGroupTagsKey");

//
// Create Resource Group
//
var resourceGroup = new ResourceGroup("resourceGroup", new ResourceGroupArgs
{
    ResourceGroupName = resourceGroupName,
    Location = resourceGroupLocation
    Tags = resourceGroupTags
});

// ... ... ...