cslots: Initial setup.

Cslots - short for compressed slots, will be an attempt to reduce
AST memory consumption by only including non-default slots in
objects.

experimental/cslots/.gitignore

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+*.c
+*.so
+*.egg-info
+build

experimental/cslots/setup.py

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+from setuptools import setup, Extension
+
+setup(
+    name="cslots",
+    version="1.0.0",
+    ext_modules=[
+        Extension("cslots", [ "cslots.pyx" ]),
+    ])

experimental/cslots/test.sh

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+#!/bin/bash
+
+set -e
+
+pip install -e .
+python3 -m pytest

experimental/cslots/test_cslots.py

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+import cslots
+
+def test_cslots_import():
+    assert cslots