WIP - add extractor, generate snippet_data

node_modules/mdn-data/css/readme.md

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+# MDN CSS data
+
+This folder contains data about the different features of the [CSS](https://developer.mozilla.org/en-US/docs/Web/CSS) language.
+
+## Different types of CSS data
+
+The CSS data is split into these parts:
+
+* **at-rules**:
+[data](https://github.com/mdn/data/blob/master/css/at-rules.json) |
+[schema](https://github.com/mdn/data/blob/master/css/at-rules.schema.json) |
+[docs](https://github.com/mdn/data/blob/master/css/at-rules.md)
+* **properties**:
+[data](https://github.com/mdn/data/blob/master/css/properties.json) |
+[schema](https://github.com/mdn/data/blob/master/css/properties.schema.json) |
+[docs](https://github.com/mdn/data/blob/master/css/properties.md)
+* **selectors**:
+[data](https://github.com/mdn/data/blob/master/css/selectors.json) |
+[schema](https://github.com/mdn/data/blob/master/css/selectors.schema.json) |
+[docs](https://github.com/mdn/data/blob/master/css/selectors.md)
+* **syntaxes**:
+[data](https://github.com/mdn/data/blob/master/css/syntaxes.json) |
+[schema](https://github.com/mdn/data/blob/master/css/syntaxes.schema.json) |
+[docs](https://github.com/mdn/data/blob/master/css/syntaxes.md)
+* **types**:
+[data](https://github.com/mdn/data/blob/master/css/types.json) |
+[schema](https://github.com/mdn/data/blob/master/css/types.schema.json) |
+[docs](https://github.com/mdn/data/blob/master/css/types.md)
+* **units**:
+[data](https://github.com/mdn/data/blob/master/css/units.json) |
+[schema](https://github.com/mdn/data/blob/master/css/units.schema.json) |
+[docs](https://github.com/mdn/data/blob/master/css/units.md)