Need Close Icon

[ggedde]

Before submitting a new icon request, please confirm the following:

• [X] I have searched all issues to make sure there isn't a request for this icon.
• [X] I have searched the current library to make sure the icon doesn't already exist.
• [X] I only intend to request a single icon (or a few near-identical ones) in this issue.

What would you use this icon for?

A close button for closing modals, alerts, etc

Give us an example of what this icon might look like.

It should look like the "close" icon of the MDI library, but just thinner to match the rest of the MDI Light library.