react-getting-started

@tanstack

End-to-end first-table journey for `@tanstack/react-table` v9. Install the React adapter, declare `features` via `tableFeatures()`, declare `rowModels` factories with their *Fns parameters (`createSortedRowModel(sortFns)` etc.), create a column helper with both `TFeatures` and `TData` generics, instantiate `useTable`, and render with `<table.FlexRender>`. New users land here, not on `useLegacyTable`.