add arxiv reference

README.md

@@ -1,3 +1,17 @@
+# LEAF-GP
+This repository contains scripts featured in: <cite-article>.
+
+Please cite this work as:
+```
+@article{thebelt2022leafgp,
+  title={{Tree ensemble kernels for Bayesian optimization with known constraints over mixed-feature spaces}},
+  author={Thebelt, Alexander and Tsay, Calvin and Lee, Robert M and Sudermann-Merx, Nathan and Walz, David and Shafei, Behrang and Misener, Ruth},
+  eprint={2207.00879},
+  archivePrefix={arXiv},
+  year={2022}
+}
+```
+
 ## LEAF-GP Benchmarks
 
 ## Installation - Linux
@@ -48,4 +62,4 @@ You can also modify the call by using optional arguments:
 - `-rnd-seed`: random seed to evaluate
 - `-solver-type`: pick either `global` or `sampling`, referring to `LEAF-GP` and `LEAF-GP-RND`, respectively
 - `-has-larger-model`: picking this one uses a larger tree ensemble model for `LEAF-GP` 
-  used for the `vae_nas` benchmark
+  used for the `vae_nas` benchmark