Subject Icons
**Describe the requested icon**
I would like some icons referring to some subject such as Medicine, Psychology, among all others... It's pretty hard to find something that covers most of them by the same standard, so it would be very good to see.

**Screenshots**
![mental-health](https://user-images.githubusercontent.com/73766081/237008995-92bfa131-56b5-4e44-87c3-e85a318bce98.png)
![caduceus-symbol](https://user-images.githubusercontent.com/73766081/237009010-bd345015-6478-41aa-81d3-050c857514e3.png)
![nutrition (1)](https://user-images.githubusercontent.com/73766081/237009266-06bfc123-bace-4102-bf20-ca8d665ef6ec.png)
![computer-science](https://user-images.githubusercontent.com/73766081/237009565-2935cbb1-cb1f-49d0-afdf-ed078881a37d.png)
