Adding QrCode Action

Controllers/HomeController.cs

 using System;
 using System.Collections.Generic;
+using System.Data;
 using System.Diagnostics;
+using System.Drawing;
+using System.Drawing.Imaging;
+using System.IO;
 using System.Linq;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Mvc;
+using QRCoder;
+using UnityEngine;
+using Color = System.Drawing.Color;
 
 namespace Stratis.Guru.Controllers
 {
@@ -31,5 +38,16 @@ namespace Stratis.Guru.Controllers
         {
             return View();
         }
+
+        [Route("qr/{value}")]
+        public IActionResult Qr(string value)
+        {
+            var memoryStream = new MemoryStream();
+            var qrGenerator = new QRCodeGenerator();
+            var qrCodeData = qrGenerator.CreateQrCode(value, QRCodeGenerator.ECCLevel.L);
+            var qrCode = new QRCode(qrCodeData);
+            qrCode.GetGraphic(20, Color.Black, Color.White, false).Save(memoryStream, ImageFormat.Png);
+            return File(memoryStream.ToArray(), "image/png");
+        }
     }
 }
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