Add initial touch bar docs

docs/api/touch-bar-color-picker.md

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+## Class: TouchBarColorPicker
+
+> Create a color picker in the touch bar for native macOS applications
+
+Process: [Main](../tutorial/quick-start.md#main-process)
+
+### `new TouchBarColorPicker(options)`
+
+* `options` Object
+  * `availableColors` String[] (optional) - Array of hex color strings to
+    appear as possible colors to select.
+  * `selectedColor` String (optional) - The selected hex color in the picker,
+    i.e `#ABCDEF`.
+  * `change` Function (optional) - Function to call when a color is selected.
+
+### Instance Properties
+
+The following properties are available on instances of `TouchBarColorPicker`:
+
+#### `touchBarColorPicker.availableColors`
+
+The color picker's available colors to select. Changing this value immediately
+updates the color picker in the touch bar.
+
+#### `touchBarColorPicker.selectedColor`
+
+The color picker's currently selected color. Changing this value immediately
+updates the color picker in the touch bar.