Add CITATION.bib

CITATION.bib

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+@article{DifferentialEquations.jl-2017,
+ author = {Rackauckas, Christopher and Nie, Qing},
+ doi = {10.5334/jors.151},
+ journal = {},
+ keywords = {Applied Mathematics},
+ note = {Exported from https://app.dimensions.ai on 2019/05/05},
+ number = {1},
+ pages = {},
+ title = {DifferentialEquations.jl – A Performant and Feature-Rich Ecosystem for Solving Differential Equations in Julia},
+ url = {https://app.dimensions.ai/details/publication/pub.1085583166 and http://openresearchsoftware.metajnl.com/articles/10.5334/jors.151/galley/245/download/},
+ volume = {5},
+ year = {2017}
+}