make a proper package

bb2etp/__init__.py

+from .core import *
\ No newline at end of file

pyproject.toml

@@ -9,3 +9,17 @@ description = "A description of your module"
 authors = [
     { name = "Jonas Eppelt", email = "jonas.eppelt@kit.edu" }
 ]
+
+[tool.setuptools]
+packages = ["find:"]
+
+[project.classifiers]
+classifiers = [
+    "Development Status :: 3 - Alpha",
+    "Intended Audience :: Developers",
+    "License :: OSI Approved :: MIT License",
+    "Programming Language :: Python :: 3",
+    "Programming Language :: Python :: 3.6",
+    "Programming Language :: Python :: 3.7",
+    "Programming Language :: Python :: 3.8"
+]
\ No newline at end of file