chore: add dracula theme themes.md (#154)

Author: TIMMY5484

docs/advanced-usage/themes.md

@@ -18,4 +18,5 @@ For this reason, the theming heroes of the Spicetify community have created a hu
 7. [JulienMaille/dribbblish-dynamic-theme](https://github.com/JulienMaille/dribbblish-dynamic-theme) (not maintained)
 8. [sanoojes/spicetify-lucid](https://github.com/sanoojes/spicetify-lucid)
 9. [Skaytacium/Gruvify](https://github.com/Skaytacium/Gruvify)
-10. Insert your theme here!
+10. [dracula/spicetify](https://github.com/dracula/spicetify)
+11. Insert your theme here!