message: docs: put sections & links
diff: @@ -35,3 +35,22 @@ client.record
  console.log(err);
  });
  ```
  +
  +## KintoneRestAPIClient
  +
  +## KintoneRestAPIError
  +
  +## References
  +
  +- [Record](docs/record.md)
  +- [App](docs/app.md)
  +- [File](docs/file.md)
  +- [BulkRequest](docs/bulkRequest.md)
  +
  +## Contribution Guide
  +
  +- [CONTRIBUTING.md](../../CONTRIBUTING.md)
  +
  +## License
  +
  +- [MIT](LICENSE)
  