Added README to mapping workshop

Author: shannonturner

Workshop Mapping/README.md

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+### Mapping Campus Sexual Assaults
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+This is a presentation to help introduce students to mapping, data visualization, and geocoding.
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+It's based on [a map I created of colleges and universities that reported zero sexual assaults on campus in a three-year period](https://shannonvturner.com/seriously).
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+See also [https://github.com/shannonturner/seriously](https://github.com/shannonturner/seriously) for the geocoder and resulting json.