chore[swagger]:add swagger online validation
chore[swagger]:add swagger online validation

- validate the API swagger spec with the online validation tool
- introduce the validation badge into the README
reasonerjt/harbor,wy65701436/harbor,wy65701436/harbor,reasonerjt/harbor,wy65701436/harbor,wy65701436/harbor,wy65701436/harbor,wy65701436/harbor,reasonerjt/harbor,reasonerjt/harbor,reasonerjt/harbor,reasonerjt/harbor