update docs

Signed-off-by: NAnnie_wang <annie.wangli@huawei.com>

en/application-dev/reference/apis/Readme-EN.md

@@ -146,6 +146,7 @@
   - [@ohos.privacyManager](js-apis-privacyManager.md)
   - [@ohos.security.huks ](js-apis-huks.md)
   - [@ohos.userIAM.userAuth ](js-apis-useriam-userauth.md)
+  - [@ohos.userIAM.faceAuth](js-apis-useriam-faceauth.md)
   - [@system.cipher](js-apis-system-cipher.md)
   
 - Data Management

en/application-dev/reference/apis/js-apis-useriam-faceauth.md

+# Facial Authentication
+
+The **userIAM.faceAuth** module provides APIs for face enrollment.
+
+> **NOTE**
+>
+> The initial APIs of this module are supported since API version 9. Newly added APIs will be marked with a superscript to indicate their earliest API version.
+>
+> The APIs provided by this module are system APIs.
+
+## Modules to Import
+
+```js
+import userIAM_faceAuth from '@ohos.userIAM.faceAuth';
+```
+
+## FaceAuthManager
+
+Provides APIs for facial authentication management.
+
+### constructor
+
+constructor()
+
+A constructor used to create a **FaceAuthManager** object.
+
+**System capability**: SystemCapability.UserIAM.UserAuth.FaceAuth
+
+**Return value**
+
+| Type                  | Description                |
+| ---------------------- | -------------------- |
+| [FaceAuthManager](#faceauthmanager) | **FaceAuthManager** object.|
+
+**Example**
+
+  ```js
+  import userIAM_faceAuth from '@ohos.userIAM.faceAuth';
+
+  let faceAuthManager = new userIAM_faceAuth.FaceAuthManager()
+  ```
+
+### setSurfaceId
+
+setSurfaceId(surfaceId: string): ResultCode;
+
+Sets an [XComponent surface ID](../arkui-ts/ts-basic-components-xcomponent.md#getxcomponentsurfaceid) for the face preview page in the face enrollment process.
+
+**System capability**: SystemCapability.UserIAM.UserAuth.FaceAuth
+
+**Parameters**
+
+| Name        | Type                              | Mandatory| Description                      |
+| -------------- | ---------------------------------- | ---- | -------------------------- |
+| surfaceId       | string     | Yes  | ID of the surface held by the [XComponent](../arkui-ts/ts-basic-components-xcomponent.md#getxcomponentsurfaceid).|
+
+**Return value**
+
+| Type      | Description                                                        |
+| ---------- | ------------------------------------------------------------ |
+| [ResultCode](#resultcode) | Operation result code.|
+
+**Example**
+
+  ```js
+  import userIAM_faceAuth from '@ohos.userIAM.faceAuth';
+
+  let faceAuthManager = new userIAM_faceAuth.FaceAuthManager()
+  faceAuthManager.setSurfaceId("0");
+  ```
+
+## ResultCode
+
+ Enumerates the operation result codes.
+
+ **System capability**: SystemCapability.UserIAM.UserAuth.FaceAuth
+
+| Name                   | Default Value| Description                |
+| ----------------------- | ------ | -------------------- |
+| SUCCESS                 | 0      | The operation is successful.          |
+| FAIL                    | 1      | The operation fails.          |