chore: import upstream snapshot with attribution

docs/references/nature_bme.bib

@@ -0,0 +1,10 @@
+@article{lundberg2018explainable,
+  title={Explainable machine-learning predictions for the prevention of hypoxaemia during surgery},
+  author={Lundberg, Scott M and Nair, Bala and Vavilala, Monica S and Horibe, Mayumi and Eisses, Michael J and Adams, Trevor and Liston, David E and Low, Daniel King-Wai and Newman, Shu-Fang and Kim, Jerry and others},
+  journal={Nature Biomedical Engineering},
+  volume={2},
+  number={10},
+  pages={749},
+  year={2018},
+  publisher={Nature Publishing Group}
+}

docs/references/shap_nips.bib

@@ -0,0 +1,7 @@
+@incollection{NIPS2017_7062,
+title = {A Unified Approach to Interpreting Model Predictions},
+author = {Lundberg, Scott M and Lee, Su-In},
+year = {2017},
+publisher = {Curran Associates, Inc.},
+url = {http://papers.nips.cc/paper/7062-a-unified-approach-to-interpreting-model-predictions.pdf}
+}

docs/references/tree_explainer.bib

@@ -0,0 +1,10 @@
+@article{lundberg2020local2global,
+  title={From local explanations to global understanding with explainable AI for trees},
+  author={Lundberg, Scott M. and Erion, Gabriel and Chen, Hugh and DeGrave, Alex and Prutkin, Jordan M. and Nair, Bala and Katz, Ronit and Himmelfarb, Jonathan and Bansal, Nisha and Lee, Su-In},
+  journal={Nature Machine Intelligence},
+  volume={2},
+  number={1},
+  pages={2522-5839},
+  year={2020},
+  publisher={Nature Publishing Group}
+}

docs/references/treeshap_arxiv.bib

@@ -0,0 +1,6 @@
+@article{lundberg2019explainable,
+  title={Explainable AI for Trees: From Local Explanations to Global Understanding},
+  author={Lundberg, Scott M and Erion, Gabriel and Chen, Hugh and DeGrave, Alex and Prutkin, Jordan M and Nair, Bala and Katz, Ronit and Himmelfarb, Jonathan and Bansal, Nisha and Lee, Su-In},
+  journal={arXiv preprint arXiv:1905.04610},
+  year={2019}
+}