Update README

Author: eush77

README.md

@@ -11,6 +11,32 @@ Select unist nodes using css-like selectors.
 [david]: https://david-dm.org/eush77/unist-util-select
 [david-badge]: https://david-dm.org/eush77/unist-util-select.png
 
+## Example
+
+```js
+var select = require('unist-util-select');
+
+select(ast, 'paragraph emphasis > text')
+//=> array of nodes
+```
+
+## Features
+
+- [x] Type selectors: `paragraph`
+- [x] Descendant selectors: `paragraph text`
+- [x] Child selectors: `paragraph > text`
+- [x] Sibling selectors: `paragraph ~ text`
+- [x] Adjacent sibling selectors: `paragraph + text`
+- [ ] Attribute selectors: `text[value*="substr"]`
+- [ ] Universal selectors: `*`
+- [ ] Group selectors: `paragraph, text`
+
+## API
+
+#### `unistUtilSelect(ast, selector)`
+
+Applies `selector` to `ast`, returns array of matching nodes.
+
 ## Install
 
 ```

package.json

@@ -16,7 +16,10 @@
     "url": "https://github.com/eush77/unist-util-select/issues"
   },
   "keywords": [
-    "css",
+    "child",
+    "descendant",
+    "sibling",
+    "type",
     "expression",
     "mdast",
     "node",