docs(uui-input): add docs for custom css properties

Author: iOvergaard

packages/uui-input/lib/uui-input.element.ts

@@ -31,6 +31,16 @@ export type InputType =
  * @fires UUIInputEvent#change on change
  * @fires InputEvent#input on input
  * @fires KeyboardEvent#keyup on keyup
+ * @cssprop --uui-input-height - Height of the element
+ * @cssprop --uui-input-background-color - Background color of the element
+ * @cssprop --uui-input-background-color-disabled - Background color when disabled
+ * @cssprop --uui-input-background-color-readonly - Background color when readonly
+ * @cssprop --uui-input-border-width - Border width
+ * @cssprop --uui-input-border-color - Border color
+ * @cssprop --uui-input-border-color-hover - Border color on hover
+ * @cssprop --uui-input-border-color-focus - Border color on focus
+ * @cssprop --uui-input-border-color-disabled - Border color when disabled
+ * @cssprop --uui-input-border-color-readonly - Border color when readonly
  */
 @defineElement('uui-input')
 export class UUIInputElement extends FormControlMixin(