Add LIGGGHTS to adapter overviews

content/docs/adapters/adapter-overview.md

@@ -41,6 +41,7 @@ Wherever meaningful (license, maturity of the project, no other home), we host t
 | [FEniCS-X](https://fenicsproject.org/) | [Benjamin Rodenberg, TUM](https://www.cs.cit.tum.de/sccs/personen/benjamin-rodenberg/) | [code](https://github.com/precice/fenicsx-adapter) | Structure part in CHT, FSI, any FEM | looking for maintainers! |
 | [G+Smo](https://gismo.github.io/) | [TU Delft Numerical Analysis](https://www.tudelft.nl/en/eemcs/the-faculty/departments/applied-mathematics/numerical-analysis/) |[code](https://github.com/gismo/gsPreCICE) | Structure part in FSI ||
 | [ISSM](https://github.com/ISSMteam/ISSM) | [Daniel Abele](https://github.com/dabele), [DLR Software Technology](https://www.dlr.de/sc/) | [code](https://git.rwth-aachen.de/terrabyte-dnn2sim/issm-precice) | Ice sheet model | |
+| [LIGGGHTS](https://www.cfdem.com/media/DEM/docu/Manual.html) | [via Discourse](https://precice.discourse.group/t/flexible-mesh-particle-coupling-with-precice/2616) | [code](https://github.com/r-walloner/LIGGGHTS-PUBLIC) | DEM part in CFD-DEM | see also: [validated case](https://doi.org/10.18419/DARUS-5494) |
 | [LS-DYNA](http://www.lstc.com/products/ls-dyna) | [LKR](https://www.ait.ac.at/lkr) | [code example](https://github.com/precice/lsdyna-adapter) | Continuous metal casting process ||
 | [MBDyn](https://www.mbdyn.org/) | [TU Delft Wind Energy](https://www.tudelft.nl/en/ae/organisation/departments/flow-physics-and-technology/wind-energy) | [code](https://github.com/precice/mbdyn-adapter) | Structure part in FSI ||
 | [MBDyn](https://www.mbdyn.org/) | [Politecnico di Milano DAER](https://www.aero.polimi.it/) | [documentation](https://public.gitlab.polimi.it/DAER/mbdyn/-/wikis/preCICE-MBDyn-adapter), [code](https://gitlab.com/stilita/mbdyn-esm-adapter/) | Structure part in FSI ||