add nativeapis

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

en/application-dev/reference/native-apis/raw__dir_8h.md

+# raw_dir.h
+
+
+## Overview
+
+Provides functions for operating rawfile directories.
+
+These functions include traversing and closing rawfile directories.
+
+**Since:**
+8
+
+**Related Modules:**
+
+[Rawfile](rawfile.md)
+
+
+## Summary
+
+
+### Types
+
+| Name | Description | 
+| -------- | -------- |
+| [RawDir](rawfile.md#rawdir) | Provides the function of accessing rawfile directories.  | 
+
+
+### Functions
+
+| Name | Description | 
+| -------- | -------- |
+| [OH_ResourceManager_GetRawFileName](rawfile.md#oh_resourcemanager_getrawfilename) ([RawDir](rawfile.md#rawdir) \*rawDir, int index) | Obtains the rawfile name via an index.  | 
+| [OH_ResourceManager_GetRawFileCount](rawfile.md#oh_resourcemanager_getrawfilecount) ([RawDir](rawfile.md#rawdir) \*rawDir) |Obtains the number of rawfiles in [RawDir](rawfile.md#rawdir).  | 
+| [OH_ResourceManager_CloseRawDir](rawfile.md#oh_resourcemanager_closerawdir) ([RawDir](rawfile.md#rawdir) \*rawDir) | Closes an opened [RawDir](rawfile.md#rawdir) and releases all associated resources.  |