add cursor project rule

Author: codingiran

.cursor/rules/swift-rule.mdc

@@ -0,0 +1,24 @@
+---
+alwaysApply: true
+---
+# Project Overview
+
+This project is a Swift package that provides a simple Timer API for Swift.
+
+It's written in Swift 5.10+ and uses Swift Package Manager to manage dependencies.
+
+It's using Swift 6 strict concurrency mode to ensure the code is safe and efficient.
+
+## Project Structure
+
+- Sources: The source code of the package.
+- Tests: The tests of the package.
+- Package.swift: The Swift package manager configuration file.
+- README.md: The README file of the package.
+
+## Project Rules
+
+- Always thinking before writing code.
+- Use English to think, analyze and search.
+- Use Chinese to chat with me.
+- Use English to write code comments.