Adds setup.py to support pip install -e .

setup.py

@@ -0,0 +1,20 @@
+#!/usr/bin/env python
+
+from setuptools import find_packages, setup
+
+with open("README.md") as f:
+    readme = f.read()
+
+setup(
+    author="CIME developers",
+    python_requires=">=3.5",
+    description=" Common Infrastructure for Modeling the Earth",
+    long_description=readme,
+    include_package_data=True,
+    name="CIME",
+    packages=find_packages(),
+    test_suite="CIME.tests",
+    tests_requires=["pytest"],
+    url="https://github.com/ESMCI/cime",
+    version="0.1.0"
+)