feat: login service and implement database storage

internal/utilities/response/set_default_headers.go

@@ -0,0 +1,19 @@
+package response
+
+import (
+	"context"
+	"net/http"
+)
+
+type ErrorResponseData struct {
+	Code    string `json:"code"`
+	Message string `json:"message"`
+}
+
+type ErrorResponse struct {
+	Error ErrorResponseData `json:"error"`
+}
+
+func setDefaultHeaders(ctx context.Context, headers http.Header) {
+	headers.Set("Content-Type", "application/json")
+}