add avengers data

Author: andrewflowers

Diff for: avengers/README.md

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+### Avengers
+
+This directory contains the data behind the story [Joining The Avengers Is As Deadly As Jumping Off A Four-Story Building](http://fivethirtyeight.com/features/avengers-death-comics-age-of-ultron).
+
+It includes the dataset `avengers.csv`, which details the deaths of Marvel comic book characters between the time they joined the Avengers and April 30, 2015, the week before Secret Wars #1.
+
+Header | Definition
+---|---------
+`URL`| The URL of the comic character on the Marvel Wikia
+`Name/Alias` | The full name or alias of the character
+`Appearances` | The number of comic books that character appeared in as of April 30 
+`Current?` | Is the member currently active on an avengers affiliated team?
+`Gender` | The recorded gender of the character
+`Probationary` | Sometimes the character was given probationary status as an Avenger, this is the date that happened
+`Full/Reserve` | The month and year the character was introduced as a full or reserve member of the Avnegers
+`Year` | The year the character was introduced as a full or reserve member of the Avengers
+`Years since joining` | 2015 minus the year
+`Honorary` | The status of the avenger, if they were given "Honorary" Avenger status, if they are simply in the "Academy," or "Full" otherwise
+`Death1` | Yes if the Avenger died, No if not. 
+`Return1` | Yes if the Avenger returned from their first death, No if  they did not, blank if not applicable
+`Death2` | Yes if the Avenger died a second time after their revival, No if they did not, blank if not applicable
+`Return2` | Yes if the Avenger returned from their second death, No if they did not, blank if not applicable
+`Death3` | Yes if the Avenger died a third time after their second revival, No if they did not, blank if not applicable
+`Return3` | Yes if the Avenger returned from their third death, No if they did not, blank if not applicable
+`Death4` | Yes if the Avenger died a fourth time after their third revival, No if they did not, blank if not applicable
+`Return4` | Yes if the Avenger returned from their fourth death, No if they did not, blank if not applicable
+`Death5` | Yes if the Avenger died a fifth time after their fourth revival, No if they did not, blank if not applicable
+`Return5` | Yes if the Avenger returned from their fifth death, No if they did not, blank if not applicable
+`Notes` | Descriptions of deaths and resurrections.