Create CITATION.bib

closes #525

Author: mattmilten

Diff for: CITATION.bib

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+@incollection{MaherMiltenbergerPedrosoRehfeldtSchwarzSerrano2016,
+  author = {Stephen Maher and Matthias Miltenberger and Jo{\~{a}}o Pedro Pedroso and Daniel Rehfeldt and Robert Schwarz and Felipe Serrano},
+  title = {{PySCIPOpt}: Mathematical Programming in Python with the {SCIP} Optimization Suite},
+  booktitle = {Mathematical Software {\textendash} {ICMS} 2016},
+  publisher = {Springer International Publishing},
+  pages = {301--307},
+  year = {2016},
+  doi = {10.1007/978-3-319-42432-3_37},
+}