Update README.md

Author: Picaut

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 ## Description
 
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+<IMG ALIGN="right" SRC="https://github.com/Ifsttar/I-Simpa/blob/fa9a49791a0359f4ced45bbc31edc8e581eeddd0/Docs/images/Illustrations/illustration_I_Simpa_room.png" WIDTH=350 ALT="Room illustration" TITLE="Room illustration">
 
 I-Simpa is a graphical user interface (GUI) developed to host three-dimensional numerical codes for the modeling of sound propagation in complex geometrical domains. Although I-Simpa is well adapted for energetic models (ray-tracing, sound-particle tracing, theory of reverberation…), it can be extend to use ondulatory approaches.