Add citation

CITATION.cff

@@ -0,0 +1,22 @@
+cff-version: 1.2.0
+message: "If you use this software, please cite it as below."
+authors:
+- family-names: "Elsner"
+  given-names: "Jean"
+  orcid: "https://orcid.org/0000-0003-2691-0099"
+title: "panda-py"
+url: "https://github.com/JeanElsner/panda-py"
+preferred-citation:
+  type: article
+  authors:
+  - family-names: "Elsner"
+    given-names: "Jean"
+    orcid: "https://orcid.org/0000-0003-2691-0099"
+  doi: "https://doi.org/10.1016/j.softx.2023.101532"
+  url: "https://www.sciencedirect.com/science/article/pii/S2352711023002285"
+  journal: "SoftwareX"
+  start: 101532
+  title: "Taming the Panda with Python: A powerful duo for seamless robotics programming and integration"
+  issn: "2352-7110"
+  volume: 24
+  year: 2023

README.md

@@ -39,3 +39,21 @@ in the repository's root directory.
 Hardware-in-the-loop operation requires `panda-py` to control the robot. However, the version automatically installed from PyPI may not be compatible with your robot if you use an older firmware or use the new Franka Research 3 robot. In that case refer to the panda-py [instructions](https://github.com/JeanElsner/panda-py#libfranka-version) on what version to install and where to find it.
 
 If you're having trouble running the included viewer or rendering scenes, please refer to the requirements of [dm_control](https://github.com/google-deepmind/dm_control#rendering).
+
+# Citation
+
+If you use dm_robotics_panda in published research, please consider citing the [original software paper](https://www.sciencedirect.com/science/article/pii/S2352711023002285).
+
+```
+@article{elsner2023taming,
+title = {Taming the Panda with Python: A powerful duo for seamless robotics programming and integration},
+journal = {SoftwareX},
+volume = {24},
+pages = {101532},
+year = {2023},
+issn = {2352-7110},
+doi = {https://doi.org/10.1016/j.softx.2023.101532},
+url = {https://www.sciencedirect.com/science/article/pii/S2352711023002285},
+author = {Jean Elsner}
+}
+```