README.md: add user

README.md

@@ -38,6 +38,7 @@ Some users
 - [Alessio Coltellacci](https://github.com/NotBad4U) and [Stephan Merz](https://members.loria.fr/Stephan.Merz/): encoding of TLA+ set theory in Lambdapi [[ABZ'23]](https://doi.org/10.1007/978-3-031-33163-3_29)
 - [Jean-Paul Bodeveix](https://www.irit.fr/~Jean-Paul.Bodeveix/) and Anne Grieu: certification of Event-B proofs generated by Rodin in Lambdapi
 - [Frédéric Blanqui](https://blanqui.gitlabpages.inria.fr/): translation of HOL-Light proofs to Coq [[github]](https://github.com/Deducteam/hol2dk) [[LPAR'24]](https://doi.org/10.29007/6k4x)
+- Nicolas Margulies: a formalization of cubical type theory in Lambdapi [[github]](https://github.com/nicomarg/CubicalDk)
 - [Thomas Traversié](https://thomastraversie.github.io/): implementation of set theory with pointed graphs [[LFMTP'22]](https://hal.inria.fr/hal-03740004)
 - [Quentin Garchery](https://www.lri.fr/~garchery/): certification of Why3 proof task transformations in Lambdapi [[PhD thesis]](https://inria.hal.science/tel-03560564)
 - Gabriel Hondet: translation of PVS statements to Lambdapi [[github]](https://github.com/Deducteam/personoj) [[PhD thesis]](https://inria.hal.science/tel-03855351)