add read me for paris housing dataset

notebooks/data/Paris_Housing/README.md

+# Context
+
+This dataset is about predicting house prices in paris
+
+# Content 
+
+This dataset has 17 columns with 10.000 entries each.
+
+# reference
+
+https://www.kaggle.com/mssmartypants/paris-housing-price-prediction/version/1
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