Adding octagon.conf and octagon.png to the geany-themes with potentially adding to the geany-themes project. Custom theme using the colors of the Monokai Pro Octagon neovim theme.
This is my first time trying to contribute. Hope it is ok.
Example of what my geany looks like using colorscheme. 
You can view, comment on, or merge this pull request online at:
https://github.com/geany/geany-themes/pull/83
-- Commit Summary --
* adding octagon.conf
-- File Changes --
A colorschemes/octagon.conf (117) A screenshots/octagon.png (0)
-- Patch Links --
https://github.com/geany/geany-themes/pull/83.patch https://github.com/geany/geany-themes/pull/83.diff