Add a rubocop todo-style config created by "--auto-gen-config" and inherit it

.rubocop.yml

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+inherit_from: rubocop-todo.yml

rubocop-todo.yml

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+# This configuration was generated by `rubocop --auto-gen-config`.
+# The point is for the user to remove these configuration records
+# one by one as the offences are removed from the code base.
+
+BlockAlignment:
+  Enabled: false
+
+BlockNesting:
+  Max: 4
+
+ClassLength:
+  Max: 352
+
+CommentAnnotation:
+  Enabled: false
+
+CyclomaticComplexity:
+  Max: 16
+
+Documentation:
+  Enabled: false
+
+EmptyLinesAroundBody:
+  Enabled: false
+
+Eval:
+  Enabled: false
+
+FavorUnlessOverNegatedIf:
+  Enabled: false
+
+HashSyntax:
+  Enabled: false
+
+IndentationWidth:
+  Enabled: false
+
+LineLength:
+  Max: 174
+
+MethodLength:
+  Max: 31
+
+PerlBackrefs:
+  Enabled: false
+
+RedundantReturn:
+  Enabled: false
+
+RegexpLiteral:
+  Enabled: false
+
+SignalException:
+  Enabled: false
+
+SpaceAfterComma:
+  Enabled: false
+
+SpaceAfterNot:
+  Enabled: false
+
+SpaceAroundBlockBraces:
+  Enabled: false
+
+StringLiterals:
+  Enabled: false