diff --git a/.gitignore b/.gitignore
index 429b2fc..95bf776 100644
--- a/.gitignore
+++ b/.gitignore
@@ -92,3 +92,8 @@ fabric.properties
 .idea/caches/build_file_checksums.ser
 
 !/.idea/git_toolbox_prj.xml
+
+
+# Added by cargo
+
+/target
diff --git a/5.function/Cargo.toml b/5.function/Cargo.toml
new file mode 100644
index 0000000..eca2fe4
--- /dev/null
+++ b/5.function/Cargo.toml
@@ -0,0 +1,7 @@
+[package]
+name = "function"
+# 继承 workspace 的版本号
+version.workspace = true
+edition = "2021"
+
+[dependencies]
diff --git a/5.function/src/main.rs b/5.function/src/main.rs
new file mode 100644
index 0000000..e7a11a9
--- /dev/null
+++ b/5.function/src/main.rs
@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, world!");
+}
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..f7e3df1
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,24 @@
+# 没有 [package] 为虚拟清单类型的 工作空间
+
+[workspace.package]
+# 为工作空间下的子包 定义版本号
+# 子包 可以 通过 version.workspace 继承 工作空间的版本号
+version = "0.1.0"
+
+[workspace]
+resolver = "2"
+exclude = [
+    ".git",
+    ".idea",
+    ".vscode",
+    "1.hello_world"
+]
+members = [
+    "2.hello_cargo",
+    "3.guessing_game",
+    "4.variables",
+    "5.function",
+
+    "x.bubble_sort"
+]
+
diff --git a/README.MD b/README.MD
new file mode 100644
index 0000000..95f4ee8
--- /dev/null
+++ b/README.MD
@@ -0,0 +1,45 @@
+# Rust Study
+## 自学 Rust 仓库
+
+### 参考资料
+- [Rust 语言中文社区](https://rustcc.cn/)
+- [Rust 官方文档](https://doc.rust-lang.org/book/)
+- [Rustlings](https://github.com/rust-lang/rustlings)
+- [Rust by Example](https://doc.rust-lang.org/rust-by-example/)
+- [Rustlings](https://github.com/rust-lang/rustlings)
+- [Rust 程序设计语言](https://kaisery.github.io/trpl-zh-cn/)
+
+
+## 子包创建
+例子:
+```shell
+cargo new 5.function --name function
+```
+### 编译某个子包
+```shell
+cargo build --manifest-path 5.function/Cargo.toml
+```
+### 运行某个子包
+```shell
+cargo run --manifest-path 5.function/Cargo.toml
+```
+
+### 工作空间 workspace
+参考文档 
+- https://course.rs/cargo/reference/workspaces.html
+
+#### 编译所有子包
+```shell
+cargo build --workspace
+```
+
+#### 编译工作空间下 某个子包
+```shell
+cargo build -p variables
+```
+
+#### 运行工作空间下 某个子包
+```shell
+cargo run -p function
+```
+