Turn it into an actually installable Python library

.gitignore

@@ -1 +1,4 @@
 __pycache__/
+build/
+dist/
+mtschem.egg-info/

setup.py

@@ -0,0 +1,13 @@
+#!/usr/bin/env python3
+from setuptools import setup
+
+setup(
+	name="mtschem",
+	version="0.1",
+	author="Gaël de Sailly",
+	author_email="gael-de-sailly@netc.eu",
+	packages=['mtschem'],
+	install_requires=['numpy'],
+	license="GPLv2",
+	description="Provides Input/Output for Minetest schematics",
+)