added link to ACGL wiki documentation for shader parser

include/ACGL/OpenGL/Creator/ShaderParser.hh

@@ -23,6 +23,8 @@ namespace OpenGL{
  *
  * Subclass this and provide alternative ShaderParserFactories to Creators in order to implement custom shader processing
  * Override processPragma in order to create custom pragma handling
+ *
+ * For an overview and an example, see http://www.graphics.rwth-aachen.de/redmine/projects/acgl/wiki/Custom_shader_parser
  */
 class ShaderParser
 {