Update README.md

Author: hermes-senger

README.md

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 # Simwave
 
 `Simwave` is a Python package to simulate the propagation of the constant or variable density acoustic wave in an isotropic 2D/3D medium using the finite difference method. Finite difference kernels of aribtrary spatial order (up to 20th order) are written in C for performance and compiled at run time. These kernels are called via a user-friendly Python interface for easy integration with several scientific and engineering libraries to, for example perform full-waveform inversion.
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 For further information on the `simwave` design and implementation, please see the paper https://arxiv.org/abs/2201.05278
 
 ## Installation: