[Readme] document who maintains the solvers

Author: tdavidcl

src/shammodels/gsph/README.md

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+# GSPH Solver
+
+## Overview
+Godunov Smoothed Particle Hydrodynamics (GSPH) solver implementing Godunov-type Riemann solvers within the SPH framework.
+
+## Maintainers
+- **Primary Maintainer**: Guo Yansong (guo.yansong.ngy@gmail.com)
+- **Contributors**: 
+  - Timothée David--Cléris (tim.shamrock@proton.me)
+  - Yona Lapeyre (yona.lapeyre@ens-lyon.fr)
+
+## Status
+- **Development Status**: Active
+
+## References
+- Inutsuka (2002). Reformulation of Smoothed Particle Hydrodynamics with Riemann Solver. Journal of Computational Physics.
+

src/shammodels/ramses/README.md

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+# RAMSES Solver
+
+## Overview
+Godunov Adaptive Mesh Refinement (AMR) solver based on the RAMSES code.
+
+## Maintainers
+- **Primary Maintainer**: Timothée David--Cléris (tim.shamrock@proton.me)
+- **Contributors**: 
+  - Benoit Commercon (benoit.commercon@ens-lyon.fr)
+  - Léodasce Sewanou (leodasce.sewanou@ens-lyon.fr)
+  - Yona Lapeyre (yona.lapeyre@ens-lyon.fr)
+  - Anass Serhani (anass.serhani@cnrs.fr)
+
+## Status
+- **Development Status**: Active
+
+## References
+- Teyssier (2002). Cosmological hydrodynamics with adaptive mesh refinement. A&A.
+

src/shammodels/sph/README.md

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+# SPH Solver
+
+## Overview
+Smoothed Particle Hydrodynamics (SPH) solver based on the implementation in the Phantom code.
+
+## Maintainers
+- **Primary Maintainer**: Timothée David--Cléris (tim.shamrock@proton.me)
+- **Contributors**: 
+  - Yona Lapeyre (yona.lapeyre@ens-lyon.fr)
+  - David Fang (david.fang@ikmail.com)
+  - Guo Yansong (guo.yansong.ngy@gmail.com)
+
+## Status
+- **Development Status**: Active
+
+## References
+- Price et al. (2018). Phantom: A Smoothed Particle Hydrodynamics and Magnetohydrodynamics Code for Astrophysics. PASA.
+- Monaghan (1992). Smoothed Particle Hydrodynamics. Annual Review of Astronomy and Astrophysics.
+- Price (2012). Smoothed particle hydrodynamics and magnetohydrodynamics. Journal of Computational Physics.
+

src/shammodels/zeus/README.md

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+# ZEUS Solver
+
+## Overview
+Hydrodynamics solver using the Lax–Friedrichs scheme with artificial viscosity on a staggered grid.
+
+## Maintainers
+- **Primary Maintainer**: Timothée David--Cléris (tim.shamrock@proton.me)
+
+## Status
+- **Development Status**: Active
+
+## References
+- Stone & Norman (1992). ZEUS-2D: A radiation magnetohydrodynamics code for astrophysical flows in two space dimensions.
+