fix(markdown): Added missing docs for banner macro

markdown/dev/reference/api/macros/banner/en.md

@@ -0,0 +1,29 @@
+---
+title: banner
+---
+
+The `banner` macro allows you to add repeating text along a path.
+It is provided by the [banner plugin](/reference/plugins/banner).
+
+<Example part="plugin_banner">Example of the banner macro</Example>
+
+```js
+points.from = new Point(0,0)
+points.to = new Point(320,0)
+
+paths.banner = new Path()
+  .move(points.from)
+  .line(points.to)
+
+macro('banner', {
+  path: 'banner',
+  text: 'banner plugin',
+})
+```
+
+| Property     | Default    | Type       | Description | 
+|-------------:|------------|------------|-------------|
+| `text`       |            | `text`     | The text to place repeat along the path |
+| `dy`         | `1`        | `number`   | Controls how far the text will be located above the path |
+| `spaces`     | `12`       | `number`   | The number of spaces to place between repetitions |
+| `repeat`     | `10`       | `number`   | The number of repetitions |