Support for scientific names for vitamins

[puranjay-dev]

Getting scientific names for vitamins is a very common query used by students/people in medical profession and also the food sources
Example:
dig Vitamin A @dns.toys
Common name: Vitamin A
Scientific Name: Retinol
Sources:Green leafy vegetables, nuts, tomatoes, oranges, ripe yellow fruits, guava, milk, liver, carrots, broccoli and watermelon.

I can work on a PR, if you're open to add support for this.

[knadh]

Hi @puranjay-dev. That's an nice idea. Please do send a PR.

Let's do dig vitamin.a @dns.toys