message: docs: add documentation for app.getApp
diff: - [updateAppCustomize](#updateAppCustomize)
  - [getViews](#getViews)
  - [updateViews](#updateViews)
  +- [getApp](#getApp)
  - [getAppAcl](#getAppAcl)
  - [updateAppAcl](#updateAppAcl)
  - [getAppSettings](#getAppSettings)
  @@ -423,6 +424,39 @@ Updates the View settings of an App.
  https://developer.kintone.io/hc/en-us/articles/115004880588
  +### getApp
  +
  +Gets general information of an App, including the name, description, related Space, creator and updater information.
  +
  +#### Parameters
  +
  +| Name | Type | Required | Description |
  +| ---- | :-------------------: | :------: | ----------- |
  +| id | Number or<br />String | Yes | The App ID. |
  +
  +#### Returns
  +
  +| Name | Type | Description |
  +| ------------- | :----: | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
  +| appId | String | The App ID. |
  +| code | String | The App Code of the App.<br />An empty string is returned if an App Code is not set in the App's settings. |
  +| name | String | The name of the App.<br />If Localization settings are enabled, the localized name will be returned. The localization language will be dependent on the language settings of the Kintone user authenticating this API. |
  +| description | String | The description of the App.<br />If Localization settings are enabled, the localized name will be returned. The localization language will be dependent on the language settings of the Kintone user authenticating this API. |
  +| spaceId | String | If the App was created inside a Space, it will return the Space ID. If not, null is returned. |
  +| threadId | String | If the App was created inside a Space, it will return the Thread ID of the Thread of the space it belongs to.<br />Apps that are created inside Spaces using the GUI will be automatically allocated to the default Thread.<br />If the App was not created in a Space, null is returned. |
  +| createdAt | String | The date of when the App was created. |
  +| creator | Object | The information of the user who created the App. |
  +| creator.code | String | The log in name of the creator.<br />An empty string is returned for inactive users and deleted users. |
  +| creator.name | String | The display name of the creator.<br />An empty string is returned for inactive users and deleted users. |
  +| modifiedAt | String | The date of when the App was last modified. |
  +| modifier | Object | The information of the user who last updated the App. |
  +| modifier.code | String | The log in name of the last updater.<br />An empty string is returned for inactive users and deleted users. |
  +| modifier.name | String | The display name of the last updater.<br />An empty string is returned for inactive users and deleted users. |
  +
  +#### Reference
  +
  +- https://developer.kintone.io/hc/en-us/articles/212494888
  +
  ### getAppAcl
  Gets the App permissions of an app.
  