Add material-ui/core flow-typed

[PolGuixe]

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Add the library however some changes are required.

I need to open a discussion with the maintainers.

[PolGuixe]

I have opened an issue here https://github.com/flowtype/flow-typed/issues/2395

[PolGuixe]

Probably for the variables instead of just setting string types we should import the types from flow-typed to be used in our file eg:

import {Colors} from 'flow-typed/material-ui' // I don't think the import works this way

type Props = {
buttonColor: Colors
}