[Theme request] Add hexo theme diaspora

[remi-guan]

We accept themes that meet the following criteria.

• Under the MIT license.
• Have a public Git repository URL.

Go over all the following points, and put an x in all the boxes that apply.

• You Like it
• You Forked it
• You Created it

Theme Link:

hexo-theme-diaspora

Additional context: Add any other context about the theme here.