Create CITATION.bib (#2261)

CITATION.bib

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+@article{doi:10.1021/ie4033999,
+    author = {Bell, Ian H. and Wronski, Jorrit and Quoilin, Sylvain and Lemort, Vincent},
+    title = {Pure and Pseudo-pure Fluid Thermophysical Property Evaluation and
+             the Open-Source Thermophysical Property Library CoolProp},
+    journal = {Industrial \& Engineering Chemistry Research},
+    volume = {53},
+    number = {6},
+    pages = {2498--2508},
+    year = {2014},
+    doi = {10.1021/ie4033999},
+    URL = {http://pubs.acs.org/doi/abs/10.1021/ie4033999},
+    eprint = {http://pubs.acs.org/doi/pdf/10.1021/ie4033999}
+    }