Adds CITATION file.

I think that this might create a link on the repo's front page that
directs to this file.

Author: arokem

CITATION

@@ -0,0 +1,9 @@
+@article {Kruper2021evaluating,
+	author = {Kruper, John and Yeatman, Jason D. and Richie-Halford, Adam and Bloom, David and Grotheer, Mareike and Caffarra, Sendy and Kiar, Gregory and Karipidis, Iliana I. and Roy, Ethan and Chandio, Bramsh Q. and Garyfallidis, Eleftherios and Rokem, Ariel},
+	title = {Evaluating the reliability of human brain white matter tractometry},
+	journal = {Aperture},
+	year = {2021},
+	volume = {1},
+	pages = {1-25},
+	doi = {10.1101/2021.02.24.432740},
+}