Initial commit: fastapi-traffic rate limiting library

- Core rate limiting with multiple algorithms (sliding window, token bucket, etc.)
- SQLite and memory backends
- Decorator and dependency injection patterns
- Middleware support
- Example usage files

fastapi_traffic/core/__init__.py

@@ -0,0 +1,16 @@
+"""Core rate limiting components."""
+
+from fastapi_traffic.core.algorithms import Algorithm
+from fastapi_traffic.core.config import RateLimitConfig
+from fastapi_traffic.core.decorator import rate_limit
+from fastapi_traffic.core.limiter import RateLimiter
+from fastapi_traffic.core.models import RateLimitInfo, RateLimitResult
+
+__all__ = [
+    "Algorithm",
+    "RateLimitConfig",
+    "rate_limit",
+    "RateLimiter",
+    "RateLimitInfo",
+    "RateLimitResult",
+]