public class CreateProjectSettings 

//Settings used to create a new project
CreateProjectSettings projectSettings = new CreateProjectSettings()
{
  //Sets the name of the project that will be created
  Name = @"C:\Data\MyProject1\MyProject1.aprx"
};
//Create the new project
await Project.CreateAsync(projectSettings);

//Get Pro's default project settings.
var defaultProjectSettings = Project.GetDefaultProjectSettings();
//Create a new project using the default project settings
await Project.CreateAsync(defaultProjectSettings);

//Settings used to create a new project
CreateProjectSettings projectSettings = new CreateProjectSettings()
{
  //Sets the project's name
  Name = "New Project",
  //Path where new project will be stored in
  LocationPath = @"C:\Data\NewProject",
  //Sets the project template that will be used to create the new project
  TemplatePath = @"C:\Data\MyProject1\CustomTemplate.aptx"
};
//Create the new project
await Project.CreateAsync(projectSettings);

//Settings used to create a new project
CreateProjectSettings proTemplateSettings = new CreateProjectSettings()
{
  //Sets the project's name
  Name = "New Project",
  //Path where new project will be stored in
  LocationPath = @"C:\Data\NewProject",
  //Select which Pro template you like to use
  TemplateType = TemplateType.Catalog
  //TemplateType = TemplateType.LocalScene
  //TemplateType = TemplateType.GlobalScene
  //TemplateType = TemplateType.Map
};
//Create the new project
await Project.CreateAsync(proTemplateSettings);

var projectFolder = System.IO.Path.Combine(
    System.Environment.GetFolderPath(
        Environment.SpecialFolder.MyDocuments),
    @"ArcGIS\Projects");

CreateProjectSettings ps = new CreateProjectSettings()
{
  Name = "MyProject",
  LocationPath = projectFolder,
  TemplatePath = @"C:\data\my_templates\custom_template.aptx"
};

var project = await Project.CreateAsync(ps);