Add New Theme: Synthwave

[robotgoat]

All Submissions:

• [x ] Have you checked to ensure there aren't other open Pull Requests for the same update/change?

New Theme Submissions:

Have you included all the required elements?

1. [ x] Have you included all the required elements in your theme?
2. [ x] Are images in the correct resolution?
3. [x ] Have you updated the readme.md to include reference to your creation (please add to end of the list)?

[pfeerick]

Interesting theme... not sure legibility is one of it's strengths. but each to their own! Thank you for your contribution! :) 🚀