Add link to our graphic assets at the web page

[dpliakos]

There is the case that someone who is not close to our branch needs our graphic assets.
That case would be an collaborator, a friend-branch designer etc
It would be nice if we had a link to our assets at our web page

If possible, we can add the assets themselves, but that's up to the assignee

Graphic assets url: https://github.com/ieee-ateith-sb/managing_the_branch/tree/master/graphic%20assets

WIE graphic assets url: https://github.com/ieee-ateith-sb/managing_the_branch/tree/master/graphic%20assets/WIE