"refactor(common): 重构序列化工具包，将serialize重命名为utils并添加bitset组件"

common/utils/xml/README.md

@@ -0,0 +1,41 @@
+增加了支持短标签(自关闭标签)功能的golang xml官方包.
+
+Added official package of golang xml with shortform (auto close) support.
+
+e.g.
+```xml
+<book></book> -> <book />
+<happiness type="joy"></happiness> -> <happiness type="joy" />
+```
+
+# How to get
+```
+go get github.com/ECUST-XX/xml
+```
+# Usage
+
+Replace
+
+```go
+import "encoding/xml"
+xml.MarshalIndent(v, "  ", "    ")
+```
+
+with
+
+```go
+import "github.com/ECUST-XX/xml"
+xml.MarshalIndentShortForm(v, "  ", "    ")
+```
+
+or
+
+```go
+import "github.com/ECUST-XX/xml"
+enc := xml.NewEncoder(os.Stdout)
+enc.Indent("  ", "    ")
+enc.ShortForm()
+if err := enc.Encode(v); err != nil {
+    fmt.Printf("error: %v\n", err)
+}
+```