message: docs: add documentation for record.createCursor
diff: - [getRecord](#getRecord)
  - [addRecord](#addRecord)
  - [updateRecord](#updateRecord)
  +- [createCursor](#createCursor)
  ## Overview
  @@ -93,3 +94,28 @@ Updates details of 1 record in an App by specifying its record number, or a diff
  #### Reference
  - https://developer.kintone.io/hc/en-us/articles/213149027
  +
  +### createCursor
  +
  +Adds a cursor so that large amount of records can be obtained from an App.
  +
  +#### Parameters
  +
  +| Name | Type | Required | Description |
  +| ------ | :--------------: | :------: | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
  +| app | Number or String | Yes | The App ID. |
  +| fields | Array\<String\> | | The field codes to be included in the response when using the [Get Cursor API](https://developer.kintone.io/hc/en-us/articles/360000280502). <br /> If ignored, all accessible fields in the app will be returned. |
  +| query | String | | The query string that will specify what records will be responded when using the [Get Cursor API](https://developer.kintone.io/hc/en-us/articles/360000280502). <br /> Refer to the [Get Records API](https://developer.kintone.io/hc/en-us/articles/360019245194#optfunc) document for the operators and options that can be specified in the query string. <br /> If ignored, all accessible records from the App will be returned. |
  +| size | Number or String | | The maximum number of records the [Get Cursor API](https://developer.kintone.io/hc/en-us/articles/360000280502) can retrieve from this cursor with one request. <br /> The maximum number is 500 records. If ignored, the default number of records to be retrieved is 100. |
  +
  +#### Returns
  +
  +| Name | Type | Description |
  +| ---------- | :----: | ----------------------------------------------------------- |
  +| id | String | The cursor ID. |
  +| totalCount | String | The total count of records that match the query conditions. |
  +
  +#### Reference
  +
  +- https://developer.kintone.io/hc/en-us/articles/360000280322
  +
  