Add configuration for flake8, isort and black

setup.cfg

@@ -36,3 +36,18 @@ output-dir = invenio_config_tuw/translations/
 [update_catalog]
 input-file = invenio_config_tuw/translations/messages.pot
 output-dir = invenio_config_tuw/translations/
+
+[flake8]
+max-line-length = 88
+extend-ignore = E203
+
+[isort]
+multi_line_output = 3
+include_trailing_comma = True
+force_grid_wrap = 0
+use_parentheses = True
+ensure_newline_before_comments = True
+line_length = 88
+
+[pycodestyle]
+ignore = E203,E501,W503