Meta tags for social media cards

Hi @davidtmiller, 

Congratulations for this resume design. I like it and I used it in my personal resume. 

One of the changes that I made to my resume was add meta tags for social media cards. If you think that it could be interesting to add this meta tags to this resume, I would be happy to do a pull request with this changes to your repository. 

Regards, 
Evaristo Cuesta.

