Create a ThumbnailCard for bot framework

MessageController.cs

        var reply = context.MakeMessage();

        Dictionary<string, string> cardImageUrls = new Dictionary<string, string>()
        {
            {"Nitro 5","https://static.acer.com/up/Resource/Acer/Laptops/Nitro_5/Gallery/20170613/Nitro5_gallery_01.png"},
            {"Aspire Vx 15","https://static.acer.com/up/Resource/Acer/Laptops/Aspire_VX_15/Overview/20161117/Aspire-VX-15_gallery-01.png"},
            {"Swift 7", "https://static.acer.com/up/Resource/Acer/Notebooks/Swift%207/Photogallery/20160824/Swift7-gallery-01.png"}
        };
        
        Dictionary<string, string> cardContentList =  new Dictionary<string, string>()
        {
            {"Nitro 5","Windows 10 Home Intel® Core™ i7-7700HQ processor Quad-core 2.80 GHz 39.6 cm (15.6) Full HD (1920 x 1080) 16:9 NVIDIA® GeForce® GTX 1050 with 4 GB Dedicated Memory 16 GB, DDR4 SDRAM 1 TB HDD, 128 GB SSD"},
            {"Aspire Vx 15","With its hard edged futuristic design the Aspire VX 15, looks and feels like it will help you take control."},
            {"Swift 7", "Windows 10 Home 33.8 cm (13.3) Full HD (1920 x 1080) 16:9 IPS Intel® Shared Memory 8 GB, LPDDR3 Intel® Core™ i5-7Y54 processor 1.20 GHz 256 GB SSD"}
        };
         
        foreach(var imgUrl in cardImageUrls)
        {
            List<CardImage> cardImgs = new List<CardImage>()
            {
                new CardImage(url:imgUrl.Value)
               
            }; 
            
            List<CardAction> cardAction = new List<CardAction>()
            {
                new CardAction()
                {
                    Value = imgUrl.Key,
                    Type = "imBack",
                    Title = "Detail"
                }
            };
            
            var thbCard = new ThumbnailCard()
            {
                Title = $"{imgUrl.Key}",
                Subtitle = $"{cardContentList.FirstOrDefault( c=> c.Key == imgUrl.Key)}",
                Images = cardImgs,
                Buttons = cardAction  
            };
            
            Attachment att = thbCard.ToAttachment();
            reply.Attachments.Add(att);
        }     
        
        
        reply.Text = "Products";
        reply.Speak = "Products";
        await context.PostAsync(reply);