feat(Go-StudyExample):添加两种二维码生成使用示例，添加两种图片压缩方式、添加水印示例，添加文字到图片

go.mod

@@ -2,4 +2,18 @@ module Go-StudyExample
 
 go 1.13
 
-require github.com/goinggo/mapstructure v0.0.0-20140717182941-194205d9b4a9
+require (
+	github.com/Bowery/prompt v0.0.0-20190916142128-fa8279994f75 // indirect
+	github.com/boombuler/barcode v1.0.0
+	github.com/dchest/safefile v0.0.0-20151022103144-855e8d98f185 // indirect
+	github.com/goinggo/mapstructure v0.0.0-20140717182941-194205d9b4a9
+	github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0
+	github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510 // indirect
+	github.com/kardianos/govendor v1.0.9 // indirect
+	github.com/nfnt/resize v0.0.0-20180221191011-83c6a9932646
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/skip2/go-qrcode v0.0.0-20200617195104-da1b6568686e
+	golang.org/x/image v0.0.0-20200618115811-c13761719519 // indirect
+	golang.org/x/tools v0.0.0-20200708003708-134513de8882 // indirect
+	gopkg.in/yaml.v2 v2.3.0 // indirect
+)