Docs: add image with examples of resize fit property

Author: lovell

docs/api-resize.md

@@ -14,6 +14,8 @@ When both a `width` and `height` are provided, the possible methods by which the
 
 Some of these values are based on the [object-fit][1] CSS property.
 
+<img alt="Examples of various values for the fit property when resizing" width="100%" style="aspect-ratio: 998/243" src="https://cdn.jsdelivr.net/gh/lovell/sharp@main/docs/image/api-resize-fit.png">
+
 When using a **fit** of `cover` or `contain`, the default **position** is `centre`. Other options are:
 
 *   `sharp.position`: `top`, `right top`, `right`, `right bottom`, `bottom`, `left bottom`, `left`, `left top`.

docs/image/api-resize-fit.png

@@ -111,6 +111,8 @@ function isResizeExpected (options) {
  *
  * Some of these values are based on the [object-fit](https://developer.mozilla.org/en-US/docs/Web/CSS/object-fit) CSS property.
  *
+ * <img alt="Examples of various values for the fit property when resizing" width="100%" style="aspect-ratio: 998/243" src="https://cdn.jsdelivr.net/gh/lovell/sharp@main/docs/image/api-resize-fit.png">
+ *
  * When using a **fit** of `cover` or `contain`, the default **position** is `centre`. Other options are:
  * - `sharp.position`: `top`, `right top`, `right`, `right bottom`, `bottom`, `left bottom`, `left`, `left top`.
  * - `sharp.gravity`: `north`, `northeast`, `east`, `southeast`, `south`, `southwest`, `west`, `northwest`, `center` or `centre`.