message: docs: add documentation for record.addRecord
diff: # Record
  - [getRecord](#getRecord)
  +- [addRecord](#addRecord)
  ## Overview
  @@ -43,3 +44,25 @@ Retrieves details of 1 record from an App by specifying the App ID and Record ID
  #### Reference
  - https://developer.kintone.io/hc/en-us/articles/213149287
  +
  +### addRecord
  +
  +Adds 1 record to an App.
  +
  +#### Parameters
  +
  +| Name | Type | Required | Description |
  +| ------ | :--------------: | :------: | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
  +| app | Number or String | Yes | The App ID. |
  +| record | Object | Yes | Field codes and values are specified in this object. <br /> If ignored, the record will be added with default field values. <br /> If field codes that don't exist are specified, these will be ignored. <br /> For field type specs, check the [Field Types](https://developer.kintone.io/hc/en-us/articles/212494818/) page. |
  +
  +#### Returns
  +
  +| Name | Type | Description |
  +| -------- | :----: | ------------------------------------ |
  +| id | String | The Record ID of the created Record. |
  +| revision | String | The revision number of the Record. |
  +
  +#### Reference
  +
  +- https://developer.kintone.io/hc/en-us/articles/212494628
  