Add linting rules

.flake8

@@ -0,0 +1,12 @@
+[flake8]
+# We ignore the following errors:
+#   * W503 (line break before binary operator): Black moves these to new lines
+#   * E501 (line too long): Long lines are a fact of life in comment blocks; Black handles active instances of this
+#   * E203 (whitespace before ':'): Black recommends this as disabled
+#   * F403 (import * used; unable to detect undefined names): We use a wildcard for helpers
+#   * F405 (possibly undefined name): We use a wildcard for helpers
+ignore = W503, E501, F403, F405
+extend-ignore = E203
+# Set the max line length to 88 for Black
+max-line-length = 88
+