Update README.md

Author: dlebauer

README.md

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-The BETYdb Rails App and the BETY Database
-=======
-The Biofuel Ecophysiological Traits and Yields Database (BETYdb) was developed to support research, agriculture, and policy by synthesizing available information on potential biofuel crops.  The BETYdb Rails Application is a Web application for interacting with that database.
-
-This book describes the purpose, design, and use of the Biofuel
-Ecophysiological Traits and Yields database (BETYdb). BETYdb is a
-database of plant trait and yield data that supports research,
-forecasting, and decision making associated with the development and
-production of cellulosic biofuel crops. While the content of BETYdb is
-agronomic, the structure of the database itself is general and can
-therefore be used more generally for ecosystem studies.
-
-Note that this document does not cover the suite of tables used by PEcAn. 
-These are covered in the [PEcAn documentation](https://pecan.gitbooks.io/pecan-documentation/content/).