Update README.md

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Author: trevorprater

README.md

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 <p align="center">Ordinal hashing of multidimensonal data and geographic coordinates via <a href="https://en.wikipedia.org/wiki/Z-order_curve">Morton coding / Z-ordering</a>.</p>
 
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 <p align="center">
   <img src="https://i.imgur.com/WlMKO20r.jpg" height=10% width=100%>