CreateNonEditableSnippet.cs

namespace Site.Common
{
    using System.Collections.Generic;
    using Sitecore.Data;
    using Sitecore.Data.Items;

    public class CreateNonEditableSnippet
    {
        // The dictionary keys that are passed to the ExecuteTask method
        public const string TaskId = "ItemID";
        public const string Language = "LanguageIndex";
        public const string CurrentUser = "CurrentUserName";
        public const string ProjectItem = "ci_projectPanel";
        public const string ContentItem = "ci_contentBrowser";
        public const string LibraryItem = "ci_libraryBrowser";
        public const string ImageItem = "ci_imageViewer";
        public const string WorkboxItem = "ci_workBox";

        // Relevant template IDs
        public static readonly ID PageId = new ID("{6BFA47BA-F73C-48DB-9170-C0CC94179EC7}");
        public static readonly TemplateID CustomSnippetId = new TemplateID(new ID("{C0FD5401-A2A5-4205-831D-DF06120B389E}"));

        public string ExecuteTask(Dictionary<string, object> dictionary)
        {
            Item page = Sitecore.Context.Database.GetItem(new ID(dictionary[ProjectItem].ToString()));
            if (page.TemplateID != PageId)
            {
                return "Please select a page under which to add the non-editable snippet";
            }

            page.Add("Non-Editable", CustomSnippetId);
            return $"Created custom snippet under page {page.Name}.";
        }
    }
}