add: user auth accomplished

common/utils/responses.go

@@ -0,0 +1,13 @@
+package utils
+
+type ErrorResponse struct {
+	Code int    `json:"code"`
+	Msg  string `json:"msg"`
+}
+
+func NewErrorResp(code int, msg error) *ErrorResponse {
+	return &ErrorResponse{
+		Code: code,
+		Msg:  msg.Error(),
+	}
+}