add readme and license

LICENSE

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+MIT License
+
+Copyright (c) 2018 Jorrit Poelen
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# Preston*: a biodiversity dataset tracker
+
+* Named after [Frank W. Preston (1896-1989)](https://en.wikipedia.org/wiki/Frank_W._Preston) and the Prestonian shortfall, one of the "[Seven Shortfalls that Beset Large-Scale Knowledge of Biodiversity](https://doi.org/10.1146/annurev-ecolsys-112414-054400)" as described by [Hortal et al. 2015](https://doi.org/10.1146/annurev-ecolsys-112414-054400).  
+