Added styling help text for themes.

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+To add a new theme, simply create a new directory in the electrum data directory (either ./data or your system wide local data).
+
+Inside your directory create a file called name.cfg with the name of that theme.
+
+Create another file called style.css - this will be your CSS for the theme (see other themes for reference).
+
+Documentation on Qt's stylesheets (used by Electrum):
+
+Overview: http://qt-project.org/doc/qt-4.8/stylesheet.html
+Examples: http://qt-project.org/doc/qt-4.8/stylesheet-examples.html
+Reference manual: http://doc.qt.nokia.com/4.7-snapshot/stylesheet-reference.html
+