message: docs: add documentation for app.getFieldAcl
diff: - [updateAppCustomize](#updateAppCustomize)
  - [getAppAcl](#getAppAcl)
  - [updateAppAcl](#updateAppAcl)
  +- [getFieldAcl](#getFieldAcl)
  - [getAppSettings](#getAppSettings)
  - [updateAppSettings](#updateAppSettings)
  @@ -415,6 +416,35 @@ Updates the App permissions of an App.
  - https://developer.kintone.io/hc/en-us/articles/115005445908
  +### getFieldAcl
  +
  +Gets the list of fields and field settings of an app.
  +
  +#### Parameters
  +
  +| Name | Type | Required | Description |
  +| ------- | :--------------: | :------: | ------------------------------------------------------------------------------------- |
  +| app | Number or String | Yes | The app ID. |
  +| preview | Boolean | | A flag whether to get the list of fields and field settings for pre-live environment. |
  +
  +#### Returns
  +
  +| Name | Type | Description |
  +| --------------------------------- | :-----: | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
  +| revision | String | The revision number of the app settings. |
  +| rights | Array | An array of objects that contain data of permission settings. |
  +| rights[].code | String | The field code of a field that has permission settings. |
  +| rights[].entities | Array | An array listing the entities the permissions are granted to, in order of priority. |
  +| rights[].entities[].accessibility | String | The permission granted to the entity.<ul><li>`READ`: Permissions to view only.</li><li>`WRITE`: Permissions to view and edit.</li><li>`NONE`: No permissions to view or edit.</li></ul> |
  +| rights[].entities[].entity | Object | An object containing data of the entity the permission is granted to. |
  +| rights[].entities[].entity.code | String | The code of the entity the permission is granted to. |
  +| rights[].entities[].entity.type | String | The type of the entity the permission is granted to.<ul><li>`USER`: User</li><li>`GROUP`: Group</li><li>`ORGANIZATION`: Department</li><li>`FIELD_ENTITY`: User field</li></ul> |
  +| rights[].entities[].includeSubs | Boolean | The permission inheritance settings of the department the permission is granted to.<br />It indicates whether permissions are inherited. |
  +
  +#### Reference
  +
  +- https://developer.kintone.io/hc/en-us/articles/115005362108
  +
  ### getAppSettings
  Gets the description, name, icon, revision and color theme of an App.
  