Added flake8

.flake8

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+[flake8]
+show-source=True
+statistics=True
+per-file-ignores=*/__init__.py:F401
+# E402: Module level import not at top of file
+# E501: Line too long
+# W503: Line break before binary operator
+# E203: Whitespace before ':' -> conflicts with black
+# D401: First line should be in imperative mood
+# R504: Unnecessary variable assignment before return statement.
+# R505: Unnecessary elif after return statement
+# SIM102: Use a single if-statement instead of nested if-statements
+# SIM117: Merge with statements for context managers that have same scope.
+# SIM118: Checks for key-existence checks against dict.keys() calls.
+ignore=E402,E501,W503,E203,D401,R504,R505,SIM102,SIM117,SIM118
+max-line-length = 120
+max-complexity = 30
+exclude=_*,.vscode,.git,docs/**
+# docstrings
+docstring-convention=google
+# annotations
+suppress-none-returning=True
+allow-star-arg-any=True