added in the hexo workshop md file. let's update it via prs

so @the-simian said he'd make an image for this, but maybe he should get some sleep in first, lol
I think "This Month" might be misleading. Members could potentially mix this workshop announcement with the OKC.js monthly talks.

Also, eliminating the poster image could help highlight the difference between this one-time workshop and our regularly scheduled meetups.

Those are my only critiques, I think the rest is bomb-diggity!