add additional files for pip

Author: kilon

MANIFEST.in

@@ -0,0 +1,6 @@
+# Include the README
+include *.md
+
+# Include the license file
+include LICENSE.txt
+

setup.cfg

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+[metadata]
+# This includes the license file in the wheel.
+license_file = LICENSE.txt
+
+[bdist_wheel]
+# This flag says to generate wheels that support both Python 2 and Python
+# 3. If your code will not run unchanged on both Python 2 and 3, you will
+# need to generate separate wheels for each Python version that you
+# support. Removing this line (or setting universal to 0) will prevent
+# bdist_wheel from trying to make a universal wheel. For more see:
+# https://packaging.python.org/tutorials/distributing-packages/#wheels
+universal=0