chart-box-multiple & chart-box-multiple-outline

[konstantinsaller]

Before submitting a new icon contribution, 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 understand that brand icons are no longer being added and I can use SimpleIcons for my brand icon needs.
• [X] I have followed the Material guidelines for system icons.

Tell us about your contribution.

I propose to add a chart-box-multiple Icon (chart-box-multiple-outline). As there already is a chart box icon, it would be nice to have a '-multiple' version of it. For example, in projects that need an icon for multiple datasets, these icons could be useful. (That's where I will use it)

Share a preview of your contribution.

Upload the icon source.

chart-box-multiple.zip

[jhil]

Added!

(outline too, but I forgot to copy the GitHub preview)