add missing file

pyproject.toml

+[build-system]
+requires = ["setuptools", "wheel", "scikit-build", "cmake", "ninja"]
+build-backend = "setuptools.build_meta"

setup.py

+import sys
+
+try:
+  from skbuild import setup
+except ImportError:
+  print('Please update pip, you need pip 10 or greater,\n'
+      ' or you need to install the PEP 518 requirements in pyproject.toml yourself', file=sys.stderr)
+  raise
+
+setup(
+    name="fresnel",
+    version="0.1",
+    packages=['fresnel'],
+    #package_dir={'': 'source/'},
+    cmake_install_dir='fresnel/'
+  )