update readme

README.md

@@ -149,6 +149,7 @@ target_link_libraries(${PROJECT_NAME} OrbbecSDK::OrbbecSDK)
 ## Documents
 
 * Github Pages：[https://orbbec.github.io/OrbbecSDK/](https://orbbec.github.io/OrbbecSDK/)
+* Overview Document：[doc/tutorial/English/OverviewDocument.md](doc/tutorial/English/OverviewDocument.md)
 * API Reference: [doc/api/English/index.html](https://orbbec.github.io/OrbbecSDK/doc/api/English/index.html)
 * OrbbecSDK C++ API user guide：[doc/tutorial/English/OrbbecSDK_C++_API_user_guide-v1.0.pdf](https://orbbec.github.io/OrbbecSDK/doc/tutorial/English/OrbbecSDK_C++_API_user_guide-v1.0.pdf)
 * Environment Configuration：[doc/tutorial/English/Environment_Configuration.md](doc/tutorial/English/Environment_Configuration.md)

README_CN.md

@@ -134,13 +134,15 @@ target_link_libraries(${PROJECT_NAME} OrbbecSDK::OrbbecSDK)
 ## 文档
 
 * Github：[https://orbbec.github.io/OrbbecSDK/](https://orbbec.github.io/OrbbecSDK/README_CN)
+* 概述文档：[doc/tutorial/Chinese/OverviewDocument.md](doc/tutorial/Chinese/OverviewDocument.md)
 * API 参考: [doc/api/Chinese/index.html](https://orbbec.github.io/OrbbecSDK/doc/api/Chinese/index.html)
 * OrbbecSDK C++ API user guide：[doc/tutorial/Chinese/OrbbecSDK_C++_API_user_guide-v1.0.pdf](https://orbbec.github.io/OrbbecSDK/doc/tutorial/Chinese/OrbbecSDK_C++_API_user_guide-v1.0.pdf)
 * Environment Configuration：[doc/tutorial/Chinese/Environment_Configuration.md](doc/tutorial/Chinese/Environment_Configuration.md)
 * 示例说明: [examples/README.md](examples/README_CN.md)
 * 示例描述: [doc/tutorial/Chinese/Code_Sample_Description/Sample_Description(C_C++).md](doc/tutorial/Chinese/Code_Sample_Description/Sample_Description(C_C++).md)
 
 
+
 ## 相关链接
 
 * [奥比中光主页](https://www.orbbec.com.cn/)

doc/tutorial/English/OverviewDocument.md

@@ -4,7 +4,7 @@ Welcome to the Orbbec SDK (hereinafter referred to as "SDK") tutorial! The SDK n
 # Features
 Orbbec SDK is a cross-platform (Windows, Android, Linux) software development kit that provides device parameter configuration, data stream reading and stream processing for 3D sensing cameras such as Orbbec structured light, binocular, and iToF.
 
-**Core functions: **
+**Core functions:**
 
 - Depth camera access and related parameter settings 
 - RGB camera access and related parameter settings (eg exposure and white balance)