Started intro for tutorial #304

Job	Run time
test_battery	5s
test_base_models	3s
test_calc_error	6s
copyright (3.9)	4s
test_centrifugal_pump	4s
test_composite	5s
test_data_model	5s
test_datasets	3s
test_dict_like_matrix_wrapper	4s
test_direct	5s
test_ensemble	4s
test_estimate_params	7s
test_horizon	4s
test_linear_model	4s
test_loading	3s
test_moe	3s
test_pneumatic_valve	4s
test_powertrain	3s
test_serialization	7s
test_predictors	4s
test_sim_result	6s
test_state_estimators	4s
test_surrogates	4s
test_tutorials	6s
test_uav_model	3s
test_uncertain_data	6s
	1m 56s

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