Include a line on adding screenshots/animations to PRs
# Description
<!-- What does this pull request (PR) do? Why is it necessary? -->
<!-- Tell us about your new feature, improvement, or fix! -->
+<!-- If your change includes user interface changes, please add an image, or an animation "An image is worth a thousando words!" -->
+<!-- You can use https://www.cockos.com/licecap/ or similar to create animations -->
## Type of change
<!-- Please delete options that are not relevant. -->
