Add fake setup.py (#1836)

setup.py

@@ -0,0 +1,29 @@
+import sys
+
+from setuptools import setup
+
+sys.stderr.write(
+    """
+===============================
+Unsupported installation method
+===============================
+Starlette no longer supports installation with `python setup.py install`.
+Please use `python -m pip install .` instead.
+"""
+)
+sys.exit(1)
+
+
+# The below code will never execute, however GitHub is particularly
+# picky about where it finds Python packaging metadata.
+# See: https://github.com/github/feedback/discussions/6456
+#
+# To be removed once GitHub catches up.
+
+setup(
+    name="starlette",
+    install_requires=[
+        "anyio>=3.4.0,<5",
+        "typing_extensions>=3.10.0; python_version < '3.10'",
+    ],
+)