docs: add citation to readme

README.md

@@ -4,6 +4,27 @@
 
 A CLI to create apps and labs for the Graasp ecosystem.
 
+## Citing
+
+If you use the Graasp CLI in your research, please cite the following paper:
+
+Juan Carlos Farah, Sandy Ingram, and Denis Gillet. 2022. Supporting Developers in Creating Web Apps for Education via an App Development Framework. In _HEAd'22 Conference Proceedings_ (Valencia, Spain, 2022). Editorial Universitat Politècnica de València, Valencia, Spain, 883–890. https://doi.org/10.4995/HEAD22.2022.15652
+
+```
+@inproceedings{farah2022supporting,
+    title = {Supporting {Developers} in {Creating} {Web} {Apps} for {Education} via an {App} {Development} {Framework}},
+    author = {Farah, Juan Carlos and Ingram, Sandy and Gillet, Denis},
+    booktitle = {{HEAd}'22 {Conference} {Proceedings}},
+    publisher = {Editorial Universitat Politècnica de València},
+    address = {Valencia, Spain},
+    year = {2022},
+    pages = {883--890}
+    doi = {10.4995/HEAD22.2022.15652},
+}
+```
+
+🙏
+
 ## Development
 
 To test locally, clone the repository.