add nativeapis

Signed-off-by: Nzengyawen <zengyawen1@huawei.com>

en/application-dev/reference/native-apis/_o_h_h_d_r_meta_data.md

+# OHHDRMetaData
+
+
+## Overview
+
+Defines the HDR metadata.
+
+**Related Modules:**
+
+[NativeWindow](_native_window.md)
+
+
+## Summary
+
+
+### Member Variables
+
+| Name | Description | 
+| -------- | -------- |
+| [key](#key) | Key of the HDR metadata.  | 
+| [value](#value) | Value corresponding to the metadata key.  | 
+
+
+## Member Variable Description 
+
+
+### key
+
+  
+```
+OHHDRMetadataKey OHHDRMetaData::key
+```
+**Description**<br>
+Key of the HDR metadata.
+
+
+### value
+
+  
+```
+float OHHDRMetaData::value
+```
+**Description**<br>
+Value corresponding to the metadata key.