README: Adds call to cite

Author: vauhochzett

README.md

@@ -1,5 +1,7 @@
 # RRITbed - Real-time Remote Intrusion Detection Testbed
 
+Please cite our paper when making use of this tool:
+
 **Zieglmeier, Valentin; Kacianka, Severin; Hutzelmann, Thomas; Pretschner, Alexander:** A real-time remote IDS testbed for connected vehicles. Proceedings of the 34th ACM/SIGAPP Symposium on Applied Computing - SAC '19, ACM, New York, NY, USA, 2019. *[[BibTeX]](https://mediatum.ub.tum.de/export/1485340/bibtex)* *[[Full text (DOI)]](http://dx.doi.org/10.1145/3297280.3297465)* *[[Full text (arXiv preprint)]](https://arxiv.org/abs/1811.10945)*
 
 ## Read more