Add the placeholder of i18n.

code/tool/i18n/i18n.go

@@ -0,0 +1,16 @@
+package i18n
+
+const (
+	//英文
+	ENGLISH = "ENGLISH"
+	//中文
+	CHINESE = "CHINESE"
+)
+
+func Message(lang string, key string) {
+	if lang == ENGLISH {
+
+	} else if lang == CHINESE {
+
+	}
+}