Add a basic blog with feature images

[nirmalhk7]

I've made a website with Gatsby, and I found it very hard to add feature images to blogs. By feature images I mean those which are shown on top of the blog article, as well as on the page which shows a list of blogs.

I think as a well-round starter pack, this should be in it. I'd love to hear opinion from the community and implement it myself if this is a good idea.

[nirmalhk7]

What say @apollonian ?