Add styles

[gforcada]

To make flake8-isort more helpful and less bothersome to configure it could have a notion of styles:

A style is a predefined set of isort options that will be used when a configuration option/command-line switch (just like the current --no-isort-config) is used.

i.e. flake8 --isort-style plone

[jayvdb]

It would be a great feature for isort . However I do not think it is very helpful for this flake8 plugin to override the settings that isort loads from its configuration.

[gforcada]

@jayvdb actually isort itself wants to provide styles on its own, so this flake8 plugin does not need to provide them at all and rely on what's configured on isort itself.