docs: add migrating from v1 example

README.md

@@ -109,6 +109,17 @@ following are some shots:
 
 Of course, you can also code your own writer, just implement [Writer](./writer/README.md) interface.
 
+### Migrating from v1
+
+`go-qrcode.v2` is a major upgrade from v1, and it is not backward compatible. `v2` redesigned
+the API, and it is more flexible and powerful. Features are split into different modules (according to functionality).
+
+- github.com/yeqown/go-qrcode/v2 **_core_** 
+- github.com/yeqown/go-qrcode/writer/standard **_writer/imageFile_**
+- github.com/yeqown/go-qrcode/writer/terminal **_writer/terminal_**
+
+Check [example/migrating-from-v1](./example/migrating-from-v1/main.go) for more details.
+
 ### Links
 
 * [QRCode Tourist](https://www.thonky.com/qr-code-tutorial/)

example/go.mod

@@ -3,6 +3,7 @@ module example
 go 1.17
 
 require (
+	github.com/yeqown/go-qrcode v1.5.10
 	github.com/yeqown/go-qrcode/v2 v2.0.0-beta
 	github.com/yeqown/go-qrcode/writer/standard v1.0.0-beta
 	github.com/yeqown/go-qrcode/writer/terminal v1.0.0-beta

example/migrating-from-v1/main.go

@@ -0,0 +1,70 @@
+package main
+
+import (
+	qrv2 "github.com/yeqown/go-qrcode/v2"
+	"github.com/yeqown/go-qrcode/writer/standard"
+
+	qrv1 "github.com/yeqown/go-qrcode"
+)
+
+func main() {
+	// draw a QRCode image with
+	// - "https://github.com/yeqown/go-qrcode" source text
+	// - circle shape
+	// - blue foreground color
+	// - white background color
+	// - 20 pixel block width
+	// - 20 pixel border width
+	// - The Highest error correction level
+
+	v1()
+
+	v2()
+}
+
+func v1() {
+	encodeConfig := &qrv1.Config{
+		EcLevel: qrv1.ErrorCorrectionHighest,
+		EncMode: qrv1.EncModeAuto,
+	}
+	qrc, err := qrv1.NewWithConfig("https://github.com/yeqown/go-qrcode", encodeConfig,
+		qrv1.WithCircleShape(),
+		qrv1.WithFgColorRGBHex("#0000ff"),
+		qrv1.WithBgColorRGBHex("#ffffff"),
+		qrv1.WithQRWidth(20),
+		qrv1.WithBorderWidth(20),
+	)
+	if err != nil {
+		panic(err)
+	}
+
+	err = qrc.Save("v1.jpeg")
+	if err != nil {
+		panic(err)
+	}
+}
+
+func v2() {
+	qrc, err := qrv2.NewWith("https://github.com/yeqown/go-qrcode",
+		qrv2.WithErrorCorrectionLevel(qrv2.ErrorCorrectionHighest),
+	)
+	if err != nil {
+		panic(err)
+	}
+
+	w, err := standard.New("v2.jpeg",
+		standard.WithCircleShape(),
+		standard.WithFgColorRGBHex("#0000ff"),
+		standard.WithBgColorRGBHex("#ffffff"),
+		standard.WithQRWidth(20),
+		standard.WithBorderWidth(20),
+	)
+	if err != nil {
+		panic(err)
+	}
+
+	err = qrc.Save(w)
+	if err != nil {
+		panic(err)
+	}
+}