Add docs

docs/components/feedback.md

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+# Feedback
+
+Компоненты обратной связи: alert/progress/spinner/skeleton/snackbar/pull-to-refresh.
+
+## Import
+
+```ts
+import { Alert, Progress, Spinner, Skeleton, Snackbar, PullToRefresh } from "@tria/ui";
+```
+
+## Snackbar
+
+```tsx
+const [open, setOpen] = useState(false);
+<Snackbar open={open} onOpenChange={setOpen} text="Saved" />
+```