Add assets (ketos package, architecture figure)

tutorial/assets/data/annotations_30min.csv

-filename,timestamp 
+filename,timestamp
 15653951.WAV,870.504
 15653951.WAV,913.295
 15653951.WAV,969.021

tutorial/assets/recipe.json

+{"block_list": [2, 2, 2, 2], "n_classes": 2, "initial_filters": 16, "optimizer": {"name": "Adam", "parameters": {"lr": 0.001, "beta_1": 0.9, "beta_2": 0.999, "decay": 0.01}}, "loss_function": {"name": "FScoreLoss", "parameters": {}}, "metrics": [{"name": "CategoricalAccuracy", "parameters": {}}]}
\ No newline at end of file