docs: Add README.md

Author: ntwb

packages/stylelint-config-airbnb/README.md

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+# stylelint-config-airbnb
+
+> Airbnb shareable config for stylelint.
+
+## Installation
+
+```console
+$ npm install stylelint-config-airbnb
+```
+
+## Usage
+
+Set your stylelint config to:
+
+```json
+{
+  "extends": "stylelint-config-airbnb"
+}
+```
+
+### Extending the config
+
+Simply add a `"rules"` key to your config and add your overrides there.
+
+For example, to change the `indentation` to tabs:
+
+
+```json
+{
+  "extends": "stylelint-config-airbnb",
+  "rules": {
+    "indentation": "tab"
+  }
+}
+```
+
+## [Changelog](CHANGELOG.md)
+
+## [License](LICENSE)