Experiments command validate

Description: process for validating experiment

Command class

ExperimentValidateCommand

class ExperimentValidateHandler implements ICommandHandler<ExperimentValidateCommand, boolean>

Name	Type	Mandatory
experiment	Experiment	true

boolean - True if experiment is valid

Diagram workflow

* [x] [Configuration](https://github.com/neuro-stimulator/neuro-server/wiki/Configuration)