docs: basic readme

Author: wh131462

.idea/codeStyles/Project.xml

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+# leetcode-practice-vscode
+
+A extension on vs code for leetcode-practice.
+
+## Use cases
+
+1. 练习算法
+- 题目列表,排序,筛选,解题记录
+- 每日一题
+- 验证题目(任意语言的代码用例获取,代码运行)
+- 提交题解(登录模块,国际版和国内区分)
+- 提交代码(git)
+- 展示题目详情
+2. AI增强的题解助手
+- 读取当前运行文件为上下文,给出题解,详细解释算法原理
+- 对接deepseek,绑定api key
+3. 题目收集
+- 维护自定义的题目集合
+4. 插件相关
+- 更新模块

.idea/codeStyles/codeStyleConfig.xml

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+@startuml
+title VSCode LeetCode Practice Plugin Class Diagram
+
+' 插件主入口
+class LeetCodePracticeExtension {
+  - context: ExtensionContext
+  - leetcodeService: LeetCodeService
+  - aiService: AIService
+  - webviewPanel: WebviewPanel
+  + activate(context: ExtensionContext): void
+  + deactivate(): void
+}
+
+' LeetCode 服务类
+class LeetCodeService {
+  - leetcodePracticePath: string
+  + getProblemList(): Problem[]
+  + getProblemDetail(id: string): ProblemDetail
+}
+
+' AI 服务类
+class AIService {
+  + generateSolutionHint(problemId: string): string
+}
+
+' 问题类
+class Problem {
+  + id: string
+  + title: string
+  + difficulty: string
+}
+
+' 问题详情类
+class ProblemDetail {
+  + id: string
+  + title: string
+  + content: string
+  + codeTemplate: string
+}
+
+' VSCode Webview 面板
+class WebviewPanel {
+  - panel: WebviewPanel
+  + createOrShow(context: ExtensionContext): void
+  + updateContent(htmlContent: string): void
+}
+
+LeetCodePracticeExtension --> LeetCodeService : 使用
+LeetCodePracticeExtension --> AIService : 使用
+LeetCodePracticeExtension --> WebviewPanel : 控制
+LeetCodeService --> Problem : 返回列表
+LeetCodeService --> ProblemDetail : 返回详情
+@enduml