Include an exercise for qcut()

[shrinidhin]

Describe Topic
Include an exercise to implement the qcut() function in datatables which is a function for binning columns

Suggested Set
It can possibly be included in Set 5: Column Aggregations

Sample Exercise
Exercise : Create a new column B in frame data which contains deciles of column A
Solution : data['B'] = dt.qcut([dt.f.A])

[vopani]

We can combine qcut and cut into a single exercise. But let's wait till v1.1.0 of datatable is released.