add table view settings persistence and restore info to features list section in docs (#64)

Author: RandomFractals

README.md

@@ -33,6 +33,8 @@ See [Data Preview](https://github.com/RandomFractals/vscode-data-preview) 🈸 v
 - Hide, freeze, or delete table columns
 - Freeze or delete table rows
 - Select table rows column
+- Perisist table columns layout and sort order
+- Restore customized table columns and sort configuration on vscode reload
 - Copy tab delimited table data to Clipboard
 - Save displayed table data in `CSV` (`,` or `;` delimited), `TSV`, `HTML` table, or `JSON` data array format