Add setup.py with project description comment

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: SWE Destroyer

setup.py

@@ -0,0 +1,14 @@
+# agentex-sdk: The official Python library for the Agentex API.
+#
+# This package provides convenient access to the Agentex REST API from any
+# Python 3.12+ application. It includes type definitions for all request
+# params and response fields, and offers both synchronous and asynchronous
+# clients powered by httpx.
+#
+# It also ships the `agentex` CLI for managing agents, tasks, and secrets.
+#
+# Homepage: https://github.com/scaleapi/scale-agentex-python
+
+from setuptools import setup
+
+setup()