Add selenized dark intellij colorscheme.

editors/intellij-WIP/README.md

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+🔥Disclaimer!🔥
+--------------
+
+(Author of Selenized Dark theme: https://github.com/judu)
+
+This is a modified Solarized Dark (Darcula) from IntelliJ.
+There only is a Selenized Dark theme for now. If you need the light one, you are free to
+take the light one and replace occurrences of bg and fg colors.
+
+I'm not doing it myself because I know I will not test the light theme enough.
+
+## What I did to make the theme
+
+- search and replace all occurrences of solarized colors by matching selenized ones;
+- fixed the console bright colors with actual `br_xxx` colors from selenized;
+- take all remaining colors and check them:
+  - some colors were "solarized colors with a tiny difference" (like #073643 or #083641 which are almost #073642):
+    I translated them all to the selenized color matching the closest solarized color (in
+    the example, `bg_1` #184956);
+  - some colors were "solarized colors with a not so tiny difference" (like #083f4d which
+    is basically #073642 but +01+09+09 🤷): I took the matching selenized color and
+    applied the same transformation: #19525f
+
+
+## Languages color choices
+
+Since I just changed solarized colors to selenized ones, I have not thought about [issue 68](https://github.com/jan-warchol/selenized/issues/68) and
+[issue 74](https://github.com/jan-warchol/selenized/issues/74). Feel free to amend my work
+with whatever comes out of this discussion.
+
+
+