Add docs for TouchBarScrubbber

docs/api/structures/scrubber-item.md

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+# ScrubberItem Object
+
+* `label` String - (Optional) The text to appear in this item
+* `image` NativeImage - (Optional) The image to appear in this item

docs/api/touch-bar-scrubber.md

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+## Class: TouchBarScrubber
+
+> Create a scrubber (a scrollablbe selector)
+
+Process: [Main](../tutorial/quick-start.md#main-process)
+
+### `new TouchBarScrubber(options)`
+
+* `options` Object
+  * `items` [ScrubberItem[]](structures/scrubber-item.md) - An array of items to place in this scruber
+  * `onSelect` Function - Called when the user taps an item that was not the last tapped item
+    * `selectedIndex` - The index of the item the user selected
+  * `onHightlight` Function - Called when the user taps any item
+    * `highlightedIndex` - The index of the item the user touched
+
+### Instance Properties
+
+The following properties are available on instances of `TouchBarScrubber`:
+
+#### `touchBarSegmentedControl.items`
+
+A `ScrubberItem[]` array representing the items in this scrubber.  Updating this value immediately
+updates the control in the touch bar.  Updating deep properties inside this array **does not update the touch bar**.