Add dataset descriptions and links to the source.

data/README.md

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+## Описание датасетов
+
+### SF Bay Area Bike Share
+
+https://www.kaggle.com/benhamner/sf-bay-area-bike-share
+
+stations.csv  
+trips.csv  
+
+### Stack Overflow Data Dump
+
+https://archive.org/details/stackexchange
+
+posts_sample.xml
+
+### New York City Taxi Data(2010-2013)
+
+https://uofi.app.box.com/v/NYCtaxidata 
+
+nycTaxiFares.gz  
+nycTaxiRides.gz 
+
+### List of programming languages 
+
+https://en.wikipedia.org/wiki/List_of_programming_languages 
+
+programming-languages.csv