docs(profile): add information about compile (#66)

src/12-profile/README.md

@@ -17,6 +17,8 @@ libbpf 是一个用于与 eBPF 交互的 C 库。它提供了创建、加载和
 
 在本示例中，可以通过 libbpf 库编译运行它（以 Ubuntu/Debian 为例）：
 
+**NOTE:** 首先需要安装 `cargo` 才能编译得到 `profile`, 安装方法可以参考[Cargo 手册](https://rustwiki.org/en/cargo/getting-started/installation.html)  
+
 ```console
 $ git submodule update --init --recursive
 $ sudo apt install clang libelf1 libelf-dev zlib1g-dev

src/12-profile/README_en.md

@@ -17,6 +17,8 @@ This information helps developers locate performance bottlenecks and optimize co
 
 In this example, you can compile and run it with the libbpf library (using Ubuntu/Debian as an example):
 
+**NOTE:** To compile the `profile`, you first need to install `Cargo`, as shown in ["The Cargo Book"](https://rustwiki.org/en/cargo/getting-started/installation.html)
+
 ```console
 $ git submodule update --init --recursive
 $ sudo apt install clang libelf1 libelf-dev zlib1g-dev