Add json file to initialize learner environment

notebooks.json

+{
+    "baseUrl": "https://github.com/lesteve/scikit-learn-tutorial/blob/master/"
+    "notebooks": [
+      "notebooks/01_tabular_data_exploration.ipynb",
+      "notebooks/02_basic_preprocessing.ipynb",
+      "notebooks/02_basic_preprocessing_exercise_01.ipynb",
+      "notebooks/03_basic_preprocessing_categorical_variables.ipynb",
+      "notebooks/03_basic_preprocessing_categorical_variables_exercise_01.ipynb",
+      "notebooks/03_basic_preprocessing_categorical_variables_exercise_02.ipynb",
+      "notebooks/04_basic_parameters_tuning.ipynb",
+      "notebooks/04_basic_parameters_tuning_exercise_01.ipynb",
+      "notebooks/04_basic_parameters_tuning_exercise_02.ipynb"
+    ],
+    "datasets": [
+        "datasets/adult-census.csv",
+        "datasets/cps_85_wages.csv"
+    ]
+}
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