replace setup.py with setup.cfg

setup.cfg

@@ -0,0 +1,22 @@
+[metadata]
+name = customtkinter
+version = 3.12
+description = Create modern looking GUIs with tkinter and Python
+long_description = file: README.md
+long_description_content_type = text/markdown
+url = https://github.com/TomSchimansky/CustomTkinter
+author = Tom Schimansky
+license = Creative Commons Zero v1.0 Universal
+license_file = LICENSE
+classifiers =
+    License :: CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
+    Operating System :: OS Independent
+    Programming Language :: Python :: 3 :: Only
+
+[options]
+packages =
+    customtkinter
+    customtkinter.widgets
+install_requires =
+    darkdetect
+include_package_data = True