1. install quick tagger component

2. preferences -> display -> default user interface -> playlist view
   custom columns -> add new
   Name: Rating
   Pattern: $pad($repeat(★,%rating%), 5,✩)

3. preferences -> advanced -> display -> properties dialog -> standart fields
   add "Rating=RATING;"

4. preferences -> tools -> tagging -> quick tagger
   add new
   Field Name: Rating
   Values: 0;1;2;3;4;5
   require confirmation before processing more than [1] tracks

5. preferences -> general -> keyboard shortcuts
   add new
   Filter List By: Rating
   add rating shortcuts for 0..5

6. add Rating column in playlist