update readme

README.md

@@ -39,6 +39,10 @@ sphinxsearch
 * Make sure `/storage` folder is writable
 * Set up the `/crontab` scripts by following [example](https://github.com/YGGverse/YGGo/blob/main/config/crontab.txt)
 
+#### Search textual filtering
+
+https://sphinxsearch.com/docs/current.html#extended-syntax
+
 #### JSON API
 
 Build third party applications / index distribution.
@@ -89,6 +93,7 @@ Could be enabled or disabled by `API_MANIFEST_ENABLED` option
 GET action=manifest - required
 ```
 
+
 #### Roadmap / ideas
 
 * [x] Web pages full text ranking search