Add .cursorrules for Cursor AI configuration

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: Cursor

.cursorrules

@@ -0,0 +1,18 @@
+# Cursor Rules for python-proxy-headers
+
+## Git Configuration
+- Always commit as `cursor@proxymesh.com` with name `Cursor`
+- Run these commands if not already configured:
+  ```
+  git config user.email "cursor@proxymesh.com"
+  git config user.name "Cursor"
+  ```
+
+## Pull Requests
+- Do NOT add "Made with Cursor" or similar footers to PR descriptions
+- Keep PR descriptions concise and focused on the changes
+
+## Code Style
+- Follow existing code patterns in the repository
+- Use type hints for function signatures
+- Include docstrings for public functions and classes