chore(*): Updating roadmap with done items

Author: radomirchev

ROADMAP.md

@@ -6,8 +6,8 @@
 
 1. IgxGrid Advanced Filtering [#5496](https://github.com/IgniteUI/igniteui-angular/issues/5496)
 2. IgxGrid row and cell selection modes [#4989](https://github.com/IgniteUI/igniteui-angular/issues/4989)
-3. Fluent Theme [#5335](https://github.com/IgniteUI/igniteui-angular/issues/5335)
-4. Drag and Drop enhancements [#5319](https://github.com/IgniteUI/igniteui-angular/issues/5319)
+3. **[DONE]** Fluent Theme [#5335](https://github.com/IgniteUI/igniteui-angular/issues/5335)
+4. **[DONE]** Drag and Drop enhancements [#5319](https://github.com/IgniteUI/igniteui-angular/issues/5319)
 5. Multi-View Calendar + Range DatePicker [#4282](https://github.com/IgniteUI/igniteui-angular/issues/4282)
 6. Custom grid row selector templates [#4998](https://github.com/IgniteUI/igniteui-angular/issues/4998)
 7. Per-column Filtering Strategies [#5323](https://github.com/IgniteUI/igniteui-angular/issues/5323)