Some small interim changes, adding theming.doc

docs/Setup.md

@@ -839,7 +839,6 @@ Sets the siteConfig. The siteConfig is a protected configuration for repeat use.
 the currentConfig to siteConfig. Calls to reset(configApi.defaultConfig) will reset siteConfig and currentConfig
 to the defaultConfig
 Note: currentConfig is set in this function
-
 \*Default value: At default, will mirror Global Config\*\*
 
 ### Parameters

docs/theming.md

@@ -0,0 +1,24 @@
+# Theming
+
+Mermaid as a system for theming in place. With it a site integrator can override a vast majority of attributes used when rendering a diagram.
+
+The settings for a thime can be set globally for the site with the initialize call. The example below highlights how that can look:
+
+```
+ // example
+```
+
+It is also possible to override theme settings locally in a diagram using directives.
+
+```
+ // example
+```
+
+The easiest way to make a custom theme is to start with the base theme, the theme named base and just modify these three variables:
+* primaryColor   - the base color for the theme
+* secondaryColor - A compliment color to the primary color. This color is made lighter and used as background in subgraphs for instance
+
+More specific color variables it is åpossible to change:
+* lineColor
+* textColor
+