Added getHiddenLayersSize
Added test to check getHiddenLayersSize()
Added getOutputLayerSize method
Added test to check getOutputLayerSize
Added getInputNeuron method
Added test to check getInputNeuron
Added getOutputNeuron method
Added test to check getOutputNeuron
Added getHiddenLayer method
Added getHiddenLayer test
Checked and corrected getHiddenLayer method