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Include a brief history of the churn dataset (mozilla#167)
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datasets/mozetl/churn/intro.md

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#### Background and Caveats
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The original concept for churn is captured in [this Mana
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page](https://mana.mozilla.org/wiki/display/FIREFOX/Project%3A+Firefox+Churn+v1.0).
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The original derived data-set was created in [bug
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1198537](https://bugzilla.mozilla.org/show_bug.cgi?id=1198537). The first
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[major revision (`v2`)](https://bugzilla.mozilla.org/show_bug.cgi?id=1389230) of
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this data-set added attribution, search, and uri counts. The second [major
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revision (`v3`)](https://bugzilla.mozilla.org/show_bug.cgi?id=1389231) included
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additional clients through the `new-profile` ping and adjusted the collection
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window from 10 to 5 days.
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* Each row in this dataset describes a unique segment of users
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- The number of rows is exponential with the number of dimensions
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- New fields should be added sparing to account for data-set size

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