Create JSON schema of mock type #498
Description
The source code file is https://github.com/LinuxSuRen/api-testing/blob/6495a50f513d7a9be231eb23523d0f43f422e51f/pkg/mock/types.go
The JSON file should be in https://github.com/LinuxSuRen/api-testing/tree/master/docs. For instance: the file name might be api-testing-mock.json
