chore: 初始化 Rust 第五部分学习项目

添加了 part5 项目的 Cargo 配置、示例代码和 Rust 枚举练习题文档

.trae/rules/git-commit-message.md

@@ -0,0 +1,7 @@
+---
+alwaysApply: true
+scene: git_message
+language: zh-CN
+---
+
+在此处编写规则，自定义 AI 生成提交信息的风格。

part5/Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "part5"
+version = "0.1.0"

part5/Cargo.toml

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+[package]
+name = "part5"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]

part5/src/main.rs

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+#[derive(Debug)]
+enum Direction {
+    North,
+    South,
+    East,
+    West,
+}
+
+enum IpAddr {
+    V4(String),
+    V6(String),
+}
+
+fn main() {
+    let direction = Direction::North;
+    println!(" direction: {:?}", direction);
+    let home = IpAddr::V4(String::from("127.0.0.1"));
+    // println!(" home: {:?}", home);
+}