Update README.md

Author: krylosov-aa

README.md

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 # async-pytest-httpserver
-Async mock HTTP server for pytest, built on top of aiohttp.
+async-pytest-httpserver is a fully asynchronous mock HTTP server for use in pytest tests, built on top of aiohttp.
+
+It is designed for testing code that performs HTTP requests (aiohttp, httpx, requests, etc.) without relying on real external services.
+
+## Features
+- Fully asynchronous - implemented using aiohttp.web.Application
+- Dynamic runtime mocking — add or modify mock routes while the server is running
+- Seamless integration with pytest-aiohttp and pytest-asyncio
+- Real TCP server — works with any HTTP client (aiohttp, httpx, requests, etc.)
+- Supports async handlers — easily define coroutine-based responses