Add pyproject.toml, setup.cfg

Author: rexzhang

pyproject.toml

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+[tool.isort]
+profile = "black"

setup.cfg

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+[flake8]
+# https://black.readthedocs.io/en/stable/the_black_code_style/current_style.html#flake8
+# W293 blank line contains whitespace
+# E203 Whitespace before ':'
+# E704 Multiple statements on one line (def)
+max-line-length = 88
+extend-ignore = E203, E704