soundmanager usage guide update

Signed-off-by: NGeevarghese V K <geevarghese.v.k1@huawei.com>

en/application-dev/media/sound-manager.md

+# Development Guide for usage of SoundManager
+
+## **Summary**
+This guide will show you how to use SoundManager to save and retrieve the ringtone, alarm and notification uris.
+Also the document explains how to use ringtone player APIs to play a ringtone uri.
+
+## **SoundManager Framework**
+The SoundManager interface consists of APIs which are used to save and retrieve ringtone, alarm and notification uris.
+Other APIs required for ringtone playback is also provided by SoundManager. All the uris will be saved in persistent memory of the device.
+
+Please see [**SystemSoundManager**](https://gitee.com/openharmony/docs/blob/master/en/application-dev/reference/apis/js-apis-audio.md##systemsoundmanager) for the list of APIs supported by SoundManager.
+
+
+## **Usage**
+- Here's an example of how to use SoundManager to save and retrieve alarm uri
+1. Use **getSystemSoundManager** to get an SoundManager instance.\
+   This object can be used to set and get alarm uri
+   ```
+    const systemSoundManager = audio.getSystemSoundManager();
+   ```
+
+2. Use **setSystemAlarmUri** to save system alarm uri\
+   Application should provide the application *context*, the *uri* to be saved while using this API.
+
+   ```
+    systemSoundManager.setSystemAlarmUri(context, '/data/media/alarm.wav', (err)=> {
+        if (err) {
+            console.error('Failed to setSystemAlarmUri');
+        } else {
+            console.log('Callback invoked to indicate a successful system alarm uri setting.');
+        }
+    })
+   ```
+
+3. Use **getSystemAlarmUri** to fetch system alarm uri\
+   Application should provide the application *context* while using this API.
+
+   ```
+    systemSoundManager.getSystemAlarmUri(context, (err, alarmUri)=>{
+        if (err) {
+            console.err('getSystemAlarmUri failed');
+        } else {
+            console.log('getSystemAlarmUri success: ' + alarmUri);
+        }
+    })
+   ```
+
+
+- Here's another example of how to use SoundManager for ringtone uri playback
+1. Use **getSystemSoundManager** to get an SoundManager instance.
+   ```
+    const systemSoundManager = audio.getSystemSoundManager();
+   ```
+
+2. Use **setSystemRingtoneUri** to set system ringtone uri\
+   Application should provide the application *context*, *uri* to be saved and the [*RingtoneType*](https://gitee.com/openharmony/docs/blob/master/en/application-dev/reference/apis/js-apis-audio.md#ringtonetype8) while using this API.
+
+   ```
+    systemSoundManager.setSystemRingtoneUri(context, '/data/media/ringtone_sim1.wav',
+        audio.RingtoneType.RINGTONE_TYPE_DEFAULT, (err)=> {
+        if (err) {
+            console.error('Failed to setSystemRingtoneUri');
+        } else {
+            console.log('Callback invoked to indicate a successful system ringtone uri setting.');
+        }
+    })
+   ```
+
+3. Use **getSystemRingtonePlayer** to get ringtone player instance\
+   Application should provide the application *context* and the [*RingtoneType*](https://gitee.com/openharmony/docs/blob/master/en/application-dev/reference/apis/js-apis-audio.md#RingtoneType8) while using this api.
+
+    ```
+    systemSoundManager.getSystemRingtonePlayer(null, audio.RingtoneType.RINGTONE_TYPE_DEFAULT, (err, ringtonePlayer)=>{
+        if (err) {
+            console.err('getSystemRingtonePlayer failed');
+        } else {
+            console.log('getSystemRingtonePlayer success: ');
+        }
+    });
+    ```
+
+4. Use **configure** api to configure the ringtone player
+   [*RingtoneOptions*](https://gitee.com/openharmony/docs/blob/master/en/application-dev/reference/apis/js-apis-audio.md#ringtoneoptions8) should be provided while using this api.
+
+    ```
+    let ringtoneOptions = {
+        volume: 1,
+        loop: false
+    };
+
+    ringtonePlayer.configure(ringtoneOptions, (err)=> {
+        if (err) {
+            console.error('Failed to configure ringtone options');
+        } else {
+            console.log('Callback invoked to indicate a successful ringtone options configuration.');
+        }
+    });
+    ```
+
+5. Use **start** api to start playing the ringtone\
+   *Note*: If *loop* was true in configure, the ringtone will continue to play until its stopped explicity.
+    ```
+    ringtonePlayer.start((err)=> {
+        if (err) {
+            console.error('Failed to start playing ringtone');
+        } else {
+            console.log('Ringtone start playing successfully.');
+        }
+    });
+    ```
+
+6. Use **stop** api to stop the ringtone while play is in progress
+    ```
+    ringtonePlayer.stop((err)=> {
+        if (err) {
+            console.error('Failed to stop playing ringtone');
+        } else {
+            console.log('Ringtone stop playing successfully.');
+        }
+    });
+    ```
+
+7. Use **release** api to release the ringtone player resources
+    ```
+    ringtonePlayer.release((err)=> {
+        if (err) {
+            console.error('Failed to release ringtone player resource');
+        } else {
+            console.log('Release ringtone player resource successfully.');
+        }
+    });
+    ```
+
+## **Other APIs**
+ringtonePlayer object provides few more apis like;
+
+1. **state**
+   This is a readonly variable, which will contain the current state of the ringtone player.
+   ```
+    let playerState = ringtonePlayer.state
+    ```
+
+2. **getTitle**
+   This api will return the title of the ringtone uri from the file metadata
+
+    ```
+    ringtonePlayer.getTitle((err, title)=>{
+        if (err) {
+            console.err('getTitle failed');
+        } else {
+            console.log('getTitle success: ' + title);
+        }
+    });
+    ```
+
+3. **getAudioRendererInfo**
+   This api will return the audio renderer information
+    ```
+    ringtonePlayer.getAudioRendererInfo((err, rendererInfo)=>{
+        if (err) {
+            console.err('getAudioRendererInfo failed');
+        } else {
+            console.log('getAudioRendererInfo success');
+        }
+    });
+    ```