added MLP for SNR evaluation

...Flow/MLP_models/MultiLayerPerceptron/nn/model_creation.py

...ow/MLP_models/MultiLayerPerceptron/nn/model_train_test.py

COSMOFlow/MLP_models/MultiLayerPerceptron/utilities.py

COSMOFlow/MLP_models/MultiLayerPerceptron/validate.py

...OFlow/MLP_models/models/SNR_approxiamator/function.pickle

COSMOFlow/MLP_models/models/SNR_approxiamator/model.pth

...Flow/MLP_models/models/SNR_approxiamator/xdata_inputs.npy

...Flow/MLP_models/models/SNR_approxiamator/ydata_inputs.npy

COSMOFlow/MLP_models/test_model.py

COSMOFlow/MLP_models/train_model.py

COSMOFlow/generate_data_for_MLP.py

COSMOFlow/gw_functions/gw_SNR.py

COSMOFlow/gw_functions/gw_priors.py

COSMOFlow/gw_functions/pdet_theta.py

.../make_events_REAL_from_universe_REVERSED_Empty_Catalog.py