Adds setup.cfg to set package installation parameters

It simplifies the `setup.py` maintenance

setup.cfg

@@ -0,0 +1,28 @@
+[metadata]
+name = sagittal_average
+version = 0.1.0
+author = Charlene Bultoc
+author_email = [email protected]
+license = BSD 3-Clause License
+description = Calculate the averages through a sagittal plane.
+long_description = file: README.md, LICENSE.rst
+long_description_content_type = text/markdown
+classifiers =
+    Programming Language :: Python :: 3.9
+    Operating System :: OS Independent
+    License :: OSI Approved :: BSD License
+
+[options]
+packages = find:
+python_requires = >=3.9
+# add your package requirements here
+install_requires =
+    numpy
+
+[options.entry_points]
+console_scripts =
+    sagverage = sagittal_average.command:process
+
+[options.packages.find]
+exclude =
+    *tests

setup.py

@@ -1,12 +1,3 @@
-from setuptools import setup, find_packages
+from setuptools import setup
 
-setup(
-    name="sagittal_average",
-    version="0.1.0",
-    packages=find_packages(exclude=['*tests']),
-    install_requires=['numpy'],
-    entry_points={
-        'console_scripts': [
-            'sagverage = sagittal_average.command:process'
-            ]},
-)
+setup()