Add post on first Demo Days

[MaxGhenis]

See my placeholder Markdown from #1

[MattHJensen]

How does this look? https://hackmd.io/@5zG_0RMbQZi63yqCWg_RmQ/S1g2v6yrP/edit

[MaxGhenis]

Do you want to add a sentence or two describing the scope and intent of Demo Days? Otherwise LGTM.

[MattHJensen]

Do you want to add a sentence or two describing the scope and intent of Demo Days?

Title and context seem pretty helpful here. I'm inclined to leave it as it is.

[MaxGhenis]

@MattHJensen sounds good, could you file a PR to add it to https://github.com/PSLmodels/blog/tree/master/_posts ?

[MaxGhenis]

@MattHJensen friendly ping now that @hdoupe got the blog working on the site.