code refactor, added middleware,

model/model.go

@@ -0,0 +1,11 @@
+package model
+
+type LoginStruct struct {
+	Username string `json:"username" xml:"username" form:"username"`
+	Password string `json:"password" xml:"password" form:"password"`
+}
+
+type SignupStruct struct {
+	Username string `json:"username" xml:"username" form:"username"`
+	Password string `json:"password" xml:"password" form:"password"`
+}