add docs

Signed-off-by: Nester.zhou <ester.zhou@huawei.com>

en/application-dev/reference/apis/js-apis-inputmethod.md

+# Input Method Framework
+
+> ![icon-note.gif](public_sys-resources/icon-note.gif) **NOTE**
+> The initial APIs of this module are supported since API version 6. Newly added APIs will be marked with a superscript to indicate their earliest API version.
+
+
+## Modules to Import
+
+```
+import inputMethod from '@ohos.inputMethod';
+```
+
+## inputMethod<sup>8+</sup>
+
+Provides the constants.
+
+**System capability**: SystemCapability.Miscservices.InputMethodFramework
+
+| Name| Type| Readable| Writable| Description|
+| -------- | -------- | -------- | -------- | -------- |
+| MAX_TYPE_NUM | number | Yes| No| Maximum number of supported input methods.|
+
+
+## InputMethodProperty<sup>8+</sup><a name="InputMethodProperty"></a>
+
+Describes the input method application attributes.
+
+**System capability**: SystemCapability.Miscservices.InputMethodFramework
+
+| Name| Type| Readable| Writable| Description|
+| -------- | -------- | -------- | -------- | -------- |
+| packageName | string | Yes| No| Package name.|
+| methodId | string | Yes| No| Ability name.|
+
+## inputMethod.getInputMethodController<a name="getInputMethodController"></a>
+
+getInputMethodController(): InputMethodController
+
+Obtains an [InputMethodController](#InputMethodController) instance.
+
+**System capability**: SystemCapability.Miscservices.InputMethodFramework
+
+- Return value
+
+    | Type| Description|
+    | -------- | -------- |
+    | [InputMethodController](#InputMethodController) | Returns the current **InputMethodController** instance.|
+
+- Example
+  ```
+  var InputMethodController = inputMethod.getInputMethodController();
+  ```
+## inputMethod.getInputMethodSetting<sup>8+</sup><a name="getInputMethodSetting"></a>
+
+getInputMethodSetting(): InputMethodSetting
+
+Obtains an [InputMethodSetting](#InputMethodSetting) instance.
+
+**System capability**: SystemCapability.Miscservices.InputMethodFramework
+
+- Return value
+
+  | Type                                     | Description                        |
+  | ----------------------------------------- | ---------------------------- |
+  | [InputMethodSetting](#InputMethodSetting) | Returns the current **InputMethodSetting** instance.|
+
+
+- Example
+  ```
+  var InputMethodSetting = inputMethod.getInputMethodSetting();
+  ```
+
+## InputMethodController<a name="InputMethodController"></a>
+
+In the following API examples, you must first use [getInputMethodController](#getInputMethodController) to obtain an **InputMethodController** instance, and then call the APIs using the obtained instance.
+
+### stopInput
+
+stopInput(callback: AsyncCallback&lt;boolean&gt;): void
+
+Hides the keyboard. This API uses an asynchronous callback to return the result.
+
+**System capability**: SystemCapability.Miscservices.InputMethodFramework
+
+- Parameters
+
+  | Name| Type| Mandatory| Description|
+  | -------- | -------- | -------- | -------- |
+  | callback | AsyncCallback&lt;boolean&gt; | Yes| Callback used to return whether the keyboard is successfully hidden.|
+
+- Example
+
+```
+ InputMethodController.stopInput((error)=>{
+     console.info('stopInput');
+ });
+```
+
+### stopInput
+
+stopInput(): Promise&lt;boolean&gt;
+
+Hides the keyboard. This API uses an asynchronous callback to return the result.
+
+**System capability**: SystemCapability.Miscservices.InputMethodFramework
+
+- Return value
+
+  | Type| Description|
+  | -------- | -------- |
+  | Promise&lt;boolean&gt; | Promise used to return whether the keyboard is successfully hidden.|
+
+- Example
+
+
+```
+ var isSuccess = InputMethodController.stopInput();
+ console.info('stopInput isSuccess = ' + isSuccess);
+```
+
+## InputMethodSetting<sup>8+</sup><a name="InputMethodSetting"></a>
+
+In the following API examples, you must first use [getInputMethodSetting](#getInputMethodSetting) to obtain an **InputMethodSetting** instance, and then call the APIs using the obtained instance.
+
+### listInputMethod
+
+listInputMethod(callback: AsyncCallback&lt;Array&lt;InputMethodProperty&gt;&gt;): void
+
+Obtains the list of installed input methods. This API uses an asynchronous callback to return the result.
+
+**System capability**: SystemCapability.Miscservices.InputMethodFramework
+
+- Parameters
+  | Name  | Type                                              | Mandatory| Description                  |
+  | -------- | -------------------------------------------------- | ---- | ---------------------- |
+  | callback | Array<[InputMethodProperty](#InputMethodProperty)> | Yes  | Callback used to return the list of installed input methods.|
+
+- Example
+  ```
+   InputMethodSetting.listInputMethod((properties)=>{
+     for (var i = 0;i < properties.length; i++) {
+       var property = properties[i];
+       console.info(property.packageName + "/" + property.methodId);
+     }
+  });
+  ```
+
+### listInputMethod
+
+listInputMethod(): Promise&lt;Array&lt;InputMethodProperty&gt;&gt;
+
+Obtains the list of installed input methods. This API uses an asynchronous callback to return the result.
+
+**System capability**: SystemCapability.Miscservices.InputMethodFramework
+
+- Return value
+  | Type                                                       | Description                  |
+  | ----------------------------------------------------------- | ---------------------- |
+  | Promise<Array<[InputMethodProperty](#InputMethodProperty)>> | Promise used to return the list of installed input methods.|
+
+- Example
+  ```
+   var properties = InputMethodSetting.listInputMethod();
+   for (var i = 0;i < properties.length; i++) {
+     var property = properties[i];
+     console.info(property.packageName + "/" + property.methodId);
+   }
+  ```
+
+### displayOptionalInputMethod
+
+displayOptionalInputMethod(callback: AsyncCallback&lt;void&gt;): void
+
+Displays a dialog box for selecting an input method. This API uses an asynchronous callback to return the result.
+
+**System capability**: SystemCapability.Miscservices.InputMethodFramework
+
+- Parameters
+
+| Name| Type| Mandatory| Description|
+| -------- | -------- | -------- | -------- |
+| callback | AsyncCallback&lt;void&gt; | Yes| Callback used to return the execution result.|
+
+- Example
+  ```
+   InputMethodSetting.displayOptionalInputMethod(()=>{
+     console.info('displayOptionalInputMethod is called');
+   });
+  ```
+
+### displayOptionalInputMethod
+
+displayOptionalInputMethod(): Promise&lt;void&gt;
+
+Displays a dialog box for selecting an input method. This API uses an asynchronous callback to return the result.
+
+  **System capability**: SystemCapability.Miscservices.InputMethodFramework
+
+- Return value
+
+| Type| Description|
+| -------- | -------- |
+| Promise&lt;void&gt; | Promise used to return the execution result.|
+
+  - Example
+    ```
+     InputMethodSetting.displayOptionalInputMethod();
+    ```