[gnome-icon-theme-symbolic] add a paragraph about recoloring

[Jakub Steiner <jimmac src gnome org>]

commit 2823ea6e4e51264763f01d90ff88bf43a715bffc
Author: Jakub Steiner <jimmac gmail com>
Date:   Tue Apr 27 00:29:42 2010 +0200

    add a paragraph about recoloring

 README |    9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletions(-)
---
diff --git a/README b/README
index 92a8dd6..f438ca8 100644
--- a/README
+++ b/README
@@ -27,5 +27,12 @@ The whole set is maintained in a single SVG, src/gnome-stencils.svg. Each contex
 
 Recoloring
 ----------
+The color of the icon set is defined at runtime by the gtk theme. Every single icon from the set is actually embedded inside an xml container that has a stylesheet overriding the colors.
 
-FIXME
+There is a couple of things the icon author needs to be aware of and a few things s/he can make use of. The stylesheet is setting the color of the fill for all rectangles and paths. _DO_NOT_ leave any rectangles or paths with no fill/stroke thinking it's invisible.
+
+If you need colorize specific part of an icon you need to set a class of that object. In inkscape 0.47 this is sadly only achievable by selecting the object, going into the xml editor and creating a new attribute 'class' and setting its value. There are currently 3 possible values:
+
+- warning - this maps to gtk @warning_fg
+- error - maps to @error_fg
+- success - maps to @success_fg