submodule对gitea不管用，所以直接拉了一份拉格兰

Lagrange.Core/Lagrange.OneBot/Utility/QrCodeHelper.cs

@@ -0,0 +1,49 @@
+using Net.Codecrete.QrCodeGenerator;
+
+namespace Lagrange.OneBot.Utility;
+
+internal static class QrCodeHelper
+{
+    // This part of the code is from "https://github.com/eric2788/Lagrange.Core/blob/fd20a5aec81cacd56d60f3130cf057461300fd3f/Lagrange.OneBot/Utility/QrCodeHelper.cs#L30C52-L30C52"
+    // Thanks to "https://github.com/eric2788"
+    internal static void Output(string text, bool compatibilityMode)
+    {
+        var segments = QrSegment.MakeSegments(text);
+        var qrCode = QrCode.EncodeSegments(segments, QrCode.Ecc.Low);
+
+        var (bottomHalfBlock, topHalfBlock, emptyBlock, fullBlock) = compatibilityMode ? (".", "^", " ", "@") : ("▄", "▀", " ", "█");
+
+        for (var y = 0; y < qrCode.Size + 2; y += 2)
+        {
+            for (var x = 0; x < qrCode.Size + 2; ++x)
+            {
+                var foregroundBlack = qrCode.GetModule(x - 1, y - 1);
+                var backgroundBlack = qrCode.GetModule(x - 1, y) || y > qrCode.Size;
+
+                if (foregroundBlack && !backgroundBlack)
+                {
+                    Console.Write(bottomHalfBlock);
+                }
+                else if (!foregroundBlack && backgroundBlack)
+                {
+                    Console.Write(topHalfBlock);
+                }
+                else if (foregroundBlack && backgroundBlack)
+                {
+                    Console.Write(emptyBlock);
+
+                }
+                else if (!foregroundBlack && !backgroundBlack)
+                {
+                    Console.Write(fullBlock);
+                }
+            }
+            Console.Write("\n");
+        }
+
+        if (compatibilityMode)
+        {
+            Console.WriteLine("Please scan this QR code from a distance with your smart phone.\nScanning may fail if you are too close.");
+        }
+    }
+}