Adding flake8 config

.flake8

@@ -0,0 +1,13 @@
+[flake8]
+ignore = E501,W503,E203,F821
+include = src
+max-line-length = 88
+max-doc-length = 88
+# mccabe cyclomatic complexity
+max-complexity = 7
+# flake8-expression-complexity
+max-expression-complexity = 5.5
+# flake8-class-attributes-order
+use_class_attributes_order_strict_mode=True
+# flake8-eradicate
+eradicate_whitelist_extend = "#openapi.yaml#"