add package: pyproject + src

ExtendedSession: aiohttp session wrapper with proxies, header overwrites,
ephemeral headers, domain rewriting, request previews/cURL export, and
retry-with-backoff. byte-sending isolated behind one overridable
_raw_request seam so a TLS-fingerprinting backend can subclass and swap
the client. backend-agnostic Response/FailureResponse (same surface,
falsy on failure). config-free, object-only, explicit lifecycle.
src/ multi-module layout, hatchling build.

Signed-off-by: disqualifier <dev@disqualifier.me>

pyproject.toml

@@ -0,0 +1,16 @@
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"
+
+[project]
+name = "aioweb"
+version = "0.1.0"
+description = "Async HTTP session wrapper over aiohttp — proxies, header overwrites, retries, previews. Config-free, installable."
+requires-python = ">=3.10"
+dependencies = [
+    "aiohttp>=3.9",
+    "yarl>=1.9",
+]
+
+[tool.hatch.build.targets.wheel]
+packages = ["src/aioweb"]