DOC: Add bibtex citation

CITATION.bib

@@ -0,0 +1,18 @@
+@inproceedings{Lowe2022,
+  author    = {Scott C. Lowe and
+               Robert Earle and
+               Jason d'Eon and
+               Thomas Trappenberg and
+               Sageev Oore},
+  title     = {Logical Activation Functions: Logit-space equivalents of Probabilistic Boolean Operators},
+  booktitle = {Advances in Neural Information Processing Systems},
+  volume    = {36},
+  year      = {2022},
+  pages     = {},
+  publisher = {Curran Associates, Inc.},
+  address   = {Red Hook, NY, USA},
+  url       = {https://arxiv.org/abs/2110.11940},
+  eprinttype = {arXiv},
+  eprint    = {2110.11940},
+  doi       = {10.48550/arxiv.2110.11940}
+}

README.rst

@@ -12,6 +12,11 @@ This provides the activation functions used in our paper:
 .. _doi: https://www.doi.org/10.48550/arxiv.2110.11940
 
 
+For your convenience, we provide a copy of this citation in `bibtex`_ format.
+
+.. _bibtex: https://raw.githubusercontent.com/DalhousieAI/pytorch-logit-logic/master/CITATION.bib
+
+
 Example usage:
 
 .. code:: python