Create CITATION.bib

Adding bib file for Julia Research mention

Author: sambitdash

CITATION.bib

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+@article{PDFIO.jl-2019,
+	doi = {10.21105/joss.01453},
+	url = {https://doi.org/10.21105%2Fjoss.01453},
+	year = 2019,
+	month = {nov},
+	publisher = {The Open Journal},
+	volume = {4},
+	number = {43},
+	pages = {1453},
+	author = {Sambit Dash},
+	title = {{PDFIO}: {PDF} Reader Library for native Julia},
+	journal = {Journal of Open Source Software}
+}