Update README.md

Author: cdcd72

Diff for: README.md

@@ -10,6 +10,9 @@ The practice may not be the best, but I hope to get better and better!
 
 > All infrastructure are base on **[Infra.Core](src/Core/Infra.Core)**.
 
+- BarCode
+  - [Infra.BarCode.QRCode](src/Infra/BarCode/Infra.BarCode.QRCode)
+    - Implement with [ZXing.Net](https://github.com/micjahn/ZXing.Net)
 - Cache
   - [Infra.Caching.Memory](src/Infra/Cache/Infra.Caching.Memory)
     - Implement with [Microsoft.Extensions.Caching.Memory](https://www.nuget.org/packages/Microsoft.Extensions.Caching.Memory)

Diff for: src/Infra/BarCode/Infra.BarCode.QRCode/README.md

@@ -0,0 +1,21 @@
+# Infra.BarCode.QRCode
+
+透過 ZXing.Net 實現 QRCode 編/解碼機制。  
+Implement qrcode encode/decode mechanism with ZXing.Net.
+
+## How to use
+
+> 新增 QRCode 編/解碼器實例至 DI 容器中。
+
+1. Add QRCode encoder or decoder instance to DI container
+
+    ```csharp
+    // QRCode encoder
+    builder.Services.AddSingleton<IBarCodeEncoder<QrCodeEncodeParam>, QrCodeEncoder>();
+    // QRCode decoder
+    builder.Services.AddSingleton<IBarCodeDecoder<QrCodeDecodeParam>, QrCodeDecoder>();
+    ```
+
+> 注入 `IBarCodeEncoder<QrCodeEncodeParam>` 或 `IBarCodeDecoder<QrCodeDecodeParam>` 來使用 QRCode 編/解碼器。
+
+2. Inject `IBarCodeEncoder<QrCodeEncodeParam>` or `IBarCodeDecoder<QrCodeDecodeParam>` to use QRCode encoder or decoder.