docs(Breadcrumbs): add readme

Author: Feverqwe

src/components/Breadcrumbs/README.OLD.md

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+## Breadcrumbs
+
+Breadcrumbs component. Can collapse breadcrumbs that cause overflow.
+
+### PropTypes
+
+| Name                     | Type       | Required | Default | Description                                                                                                                  |
+| :----------------------- | :--------- | :------: | :------ | :--------------------------------------------------------------------------------------------------------------------------- |
+| items                    | `Array`    |    ✓     |         | Breadcrumb items array `BreadcrumbsItem[]`                                                                                   |
+| className                | `String`   |          |         | CSS class name of root element                                                                                               |
+| renderRootContent        | `Function` |          |         | Custom render function of first item `(item: BreadcrumbsItem, isCurrent: boolean) => React.ReactNode;`)                      |
+| renderItemContent        | `Function` |          |         | Custom render function of N+1 item `(item: BreadcrumbsItem, isCurrent: boolean, isPrevCurrent: boolean) => React.ReactNode;` |
+| renderItemDivider        | `Function` |          |         | Custom render function of items separator `() => React.ReactNode;`                                                           |
+| lastDisplayedItemsCount  | `Enum`     |    ✓     |         | Number of items to display after items collapse control: `LastDisplayedItemsCount`                                           |
+| firstDisplayedItemsCount | `Enum`     |    ✓     |         | Number of items to display before items collapse control: `FirstDisplayedItemsCount`                                         |
+| popupStyle               | `String`   |          |         | Style of collapsed items popup `staircase`                                                                                   |
+
+### Examples
+
+```jsx
+const breadcrumbs = [
+  {
+    title: 'What is love',
+  },
+  {
+    title: "Baby don't hurt me",
+  },
+  {
+    title: "Don't hurt me",
+  },
+  {
+    title: 'No more',
+  },
+];
+
+return (
+  <Breadcrumbs
+    items={items}
+    lastDisplayedItemsCount={LastDisplayedItemsCount.One}
+    firstDisplayedItemsCount={FirstDisplayedItemsCount.One}
+  />
+);
+```