Create CSSLint to styleling migration guide

[ideadapt]

Because of https://github.com/CSSLint/csslint/issues/668 I think its best to have a document that explains end users how to migrate. I started with a markdown sketch. Maybe we can create a wiki page based on it, so that we can continuously update it while the implementation is in progress.

What do you think?

Here it goes:

---

Migrating from CSSLint to stylelint

This page summarizes the outcome of the initiative to consolidate CSSLint and stylelint.

CSSLint rules ported to stylelint

CSSLint	stylelint	changes
known-properties	property-no-unknown	added checkPrefixed option stylelint/styleling#1760
disallow-duplicate-properties	declaration-block-no-duplicate-properties	added ignore: ["consecutive-duplicates-with-different-values"] stylelint/styleling#1759

CSSLint rules not available in stylelint

• outline-none (see issue 1758)
• https://github.com/CSSLint/csslint/wiki/Require-standard-property-with-vendor-prefix
• https://github.com/CSSLint/csslint/wiki/Don%27t-use-too-many-web-fonts
• https://github.com/CSSLint/csslint/wiki/Disallow-unqualified-attribute-selectors
• https://github.com/CSSLint/csslint/wiki/Disallow-overqualified-elements
• ... list not complete yet!

If any of the above rules should be available in stylelint, they require to be provided via plugin. As of now, there is no such plugin. See issue 668 for an progress on this subject.

[nschonni]

There still hasn't been any consensus that the merge is actually going to happen in the other thread, but you can always do this in the Stylelint repo to help people that want to convert