Create CITATION.bib

Closes pykeen#554

Author: cthoyt

CITATION.bib

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+@article{ali2021pykeen,
+    author = {Ali, Mehdi and Berrendorf, Max and Hoyt, Charles Tapley and Vermue, Laurent and Sharifzadeh, Sahand and Tresp, Volker and Lehmann, Jens},
+    journal = {Journal of Machine Learning Research},
+    number = {82},
+    pages = {1--6},
+    title = {{PyKEEN 1.0: A Python Library for Training and Evaluating Knowledge Graph Embeddings}},
+    url = {http://jmlr.org/papers/v22/20-825.html},
+    volume = {22},
+    year = {2021}
+}