Adding missing setup.py

core/setup.py

+from setuptools import setup, find_packages
+
+# with open("README.md", "r") as fh:
+#     long_description = fh.read()
+long_description = ""
+
+setup(
+    name="registrar", # Replace with your own username
+    version="0.0.1",
+    author="",
+    author_email="",
+    description="preprocessor for PVS",
+    long_description=long_description,
+    long_description_content_type="text/markdown",
+    url="https://gitlab.eox.at/esa/prism/vs/-/tree/master/core",
+    packages=find_packages(),
+    classifiers=[
+        "Programming Language :: Python :: 3",
+        "License :: OSI Approved :: MIT License",
+        "Operating System :: OS Independent",
+    ],
+    python_requires='>=3.6',
+    entry_points={
+        "console_scripts": [
+            "registrar = registrar.cli:cli",
+        ],
+    }
+)