update readme

docs/doc/README.md

@@ -10,6 +10,17 @@ MaixCDK is not only a C++ SDK but also auto-generates Python API bindings, so de
 
 Basic Linux knowledge and a fundamental understanding of cross-compilation are required to use MaixCDK.
 
+## Basic Knowledge
+
+To use MaixCDK, it is assumed that you are already familiar with the following knowledge. If not, please learn them first or consider using [MaixPy](https://wiki.sipeed.com/maixpy/):
+
+* Proficient in using Linux for development, familiar with the terminal and common commands.
+* Proficient in either C or C++ programming language. C++ proficiency is not required, but you must understand the basic syntax and object-oriented concepts.
+* Able to actively read and analyze source code to troubleshoot issues.
+* Chinese developers should be familiar with using network proxies.
+* Understand cross-compilation.
+
+
 ## How to Find Resources and Troubleshoot
 
 1. Read [MaixCDK source code](https://github.com/sipeed/MaixCDK).
@@ -90,7 +101,6 @@ After the compilation, you will find the binary program files in the `build` dir
 
 After modifying the code, you can run `maixcdk build` again to compile.
 
-The `maixcdk build` command will scan all files for changes and rebuild them by default.  
 If you **haven’t added or removed source files**, you can run `maixcdk build2` or `maixcdk build --no-gen` for faster compilation (it will only compile the modified files).  
 > This is because the `build` command starts the entire build process from scratch, scanning files and recompiling. In contrast, the `build2` command will not scan for file additions or deletions and will only compile the edited files.  
 > Note: The `build2` command will not detect file additions or deletions, so if you **add or remove files**, you must run the `build` command again.

docs/doc_zh/README.md

@@ -10,6 +10,15 @@ MaixCDK 不光是一套 C++ SDK，同时会自动生成 Python API 绑定，即
 
 使用 MaixCDK 需要基本的 Linux 使用经验和懂交叉编译的基本概念。
 
+## 基础知识
+
+要使用 MaixCDK，均假设你已经会以下知识，不会请先自行学习或者请转角使用[MaixPy](https://wiki.sipeed.com/maixpy/)：
+* 熟练使用 Linux 进行开发，熟悉终端以及常见命令使用。
+* 熟练掌握 C/C++ 其中一种语言，其中 C++ 可以不熟练但是必须了解基础语法和面向对象概念。
+* 会主动看源码分析问题。
+* 中国开发者须了解使用网络代理。
+* 了解交叉编译。
+
 
 ## 如何找资料和解决问题
 
@@ -95,7 +104,6 @@ maixcdk build
 
 修改了代码后，再次执行`maixcdk build`即可编译。
 
-`maixcdk build` 命令默认会扫描所有文件更改再构建，
 如果你**没有增删源码文件可以执行`maixcdk build2` 或者 `maixcdk build --no-gen` 编译会更快**（只编译修改了的文件）。
 > 因为`build`命令会从头开始构建，扫描文件再编译，`build2`命令则不会扫描文件增删，直接编译编辑过的文件。
 > 注意`build2`命令不会检测到文件增加或者删除，如果**增删了文件必须再执行一遍`build`命令**。