Make sure you don’t have any other theme in your download folder to confuse you when doing this one.
Open OMDark.theme
Click the Download Raw File button in the Top-Right or use Ctl+Shft+s to download to your PC.
Open KWrite > Settings > Configure KWrite
Go to Color Themes > Theme Editor > Import
Once imported, click Apply
OMDark should now show as a choice in the pull down menu for Kate and KWrite
I believe @rugyada said she uses kwrite, but she uses the OpenMandriva Light theme. It looks great and if I was in a bright lit office, I would use that, but my space is pretty low light, so I need a dark theme.
I started with the colors in Konsole just as a novelty. I did not expect it to look great. I was wrong. So, I themed Plasma. It looked great. I themed Kate and KWrite and they look spectacular.
This is what it looks like when everything is themed with our colors. Behold!