Add hyper-darkmatter theme

[octet-stream]

Checklist for submitting an awesome plugin, theme, or resource:

• The title for my package or theme uses its npm title (hyper-plugin-example)
• The link for my package or theme uses the npmjs.com link (https://www.npmjs.com/package/hyper-plugin-example)
• There is a visual representation of what my plugin or theme does in the repo. (Plugin: screenshot or gif || Theme: screenshot of the theme applied to Hyper)
• Put your awesome item at the BOTTOM of the correct (plugin, theme, or resource) list.
• VERY IMPORTANT: I've written a short (one sentence) description for my package or theme as the description of the awesome plugin, theme, or resource in the README.md file I'm submitting in the PR.

[octet-stream]

I also added .DS_Store to the .gitignore, if you don't mind.

[iamstarkov]

👍