update docs

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

README.md

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+# PermissionManager
+
+
+## Introduction
+
+PermissionManager, a system application preset in OpenHarmony, provides permission dialog boxes, permission management settings, and permission usage records during the running of apps.
+
+The following figure shows the architecture of the PermissionManager application.
+![](figures/application-framework_en.png)
+## Directory Structure
+
+```
+/applications/standard/permission_manager
+├── entry                              # Directory of the entry module
+├── permissionmanager                  # Directory of the PermissionManager module
+│   ├── src/main/ets                   # ets module
+│   │       ├── Application            # abilitystage directory
+│   │       ├── MainAbility            # Permission management ability
+│   │       ├── ServiceExtAbility      # serviceExtension configuration
+│   │       ├── common                 # Common utilities
+│   │       └── pages                  # Pages
+│   ├──  resources                     # Global resource files
+│   └──  module.json5                  # Global configuration file
+├── signature                          # Certificate files
+└── LICENSE                            # License file
+```
+
+### How to Use
+
+For details, see [Permission Application Guide](https://gitee.com/openharmony/docs/blob/master/en/application-dev/security/accesstoken-guidelines.md).
+
+## Repositories Involved
+
+**[security\_access\_token](https://gitee.com/openharmony/security_access_token)**