Feature: Created the stylelint-config-ckeditor5 stylelint preset. Closes #575.

Author: mlewand

packages/stylelint-config-ckeditor5/.stylelintrc

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+{
+	"extends": "stylelint-config-recommended",
+	"rules": {
+		"at-rule-no-unknown": null
+	}
+}

packages/stylelint-config-ckeditor5/CHANGELOG.md

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+Changelog
+=========
+

packages/stylelint-config-ckeditor5/LICENSE.md

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+The MIT License (MIT)
+
+Copyright (c) 2003-2019, CKSource - Frederico Knabben
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

packages/stylelint-config-ckeditor5/README.md

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+CKEditor 5 stylelint preset
+========================
+
+## Usage
+
+```
+npm i --save-dev stylelint-config-ckeditor5
+```
+
+Configure stylelint with a `.stylelintrc` file using the following contents:
+
+```js
+{
+	"extends": "stylelint-config-ckeditor5"
+}
+```
+
+## Changelog
+
+See the [`CHANGELOG.md`](https://github.com/ckeditor/ckeditor5-dev/blob/master/packages/stylelint-config-ckeditor5/CHANGELOG.md) file.

packages/stylelint-config-ckeditor5/package.json

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+{
+  "name": "stylelint-config-ckeditor5",
+  "version": "1.0.0",
+  "description": "CKEditor 5 stylelint preset.",
+  "keywords": [
+    "stylelint",
+    "config",
+    "lint",
+    "ckeditor"
+  ],
+  "main": ".stylelintrc",
+  "dependencies": {
+    "stylelint-config-recommended": "^3.0.0"
+  },
+  "peerDependencies": {
+    "stylelint": ">=12.0.0"
+  },
+  "files": [
+    ".stylelintrc"
+  ],
+  "author": "CKSource (http://cksource.com/)",
+  "license": "MIT",
+  "homepage": "https://github.com/ckeditor/ckeditor5-dev/tree/master/packages/stylelint-config-ckeditor5",
+  "bugs": "https://github.com/ckeditor/ckeditor5-dev/issues",
+  "repository": "https://github.com/ckeditor/ckeditor5-dev"
+}