[gnome-text-editor] recoloring: add some notes on recoloring

[Christian Hergert <chergert src gnome org>]

commit 432b3aedd06de4eda865e6ed147d7b93c0caadce
Author: Christian Hergert <chergert redhat com>
Date:   Tue Nov 30 12:47:06 2021 -0800

    recoloring: add some notes on recoloring

 src/recoloring.md | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)
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diff --git a/src/recoloring.md b/src/recoloring.md
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+# Recoloring Text Editor
+
+The goal is to recolor Text Editor based on the style-scheme that is selected.
+The following example from Alexander Mikhaylenko shows how we can do that for the solarized theme.
+
+```css
+@define-color card_fg_color @window_fg_color;
+@define-color headerbar_fg_color @window_fg_color;
+@define-color headerbar_border_color @window_fg_color;
+@define-color popover_fg_color @window_fg_color;
+@define-color dark_fill_bg_color @headerbar_bg_color;
+@define-color view_bg_color @card_bg_color;
+@define-color view_fg_color @window_fg_color;
+/* solarized light */
+@define-color window_bg_color #fdf6e3;
+@define-color window_fg_color #073642;
+@define-color headerbar_bg_color #eee8d5;
+@define-color popover_bg_color mix(@window_bg_color, white, .1);
+@define-color card_bg_color alpha(white, .65);
+@define-color accent_bg_color #657b83;
+@define-color accent_color #586e75;
+```
+## TODO
+
+ * Make sure that we have metadata available for the style-schemes to simplify this.
+   * Is the style-scheme light or dark?
+   * What colors should we use for styling?
+ * Generate CSS based on style-scheme change.
+ * Make sure we still track light/dark modes correctly.
+