Add an Example for MulticlassSupportVectorMachine Class

[ocomeni]

Please add an example for MulticlassSupportVectorMachine Class.

TODO (optional): Describe a specific scenario you would like to see addressed.
I would like a multiclass label example that shows how to save and then load a model from a file.

Help Topic: http://accord-framework.net/docs/html/T_Accord_MachineLearning_VectorMachines_MulticlassSupportVectorMachine.htm