Magnetometer.md

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 Xylophone bar magnetometer
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 <a href="http://gitlab.onelab.info/getdp/getdp/raw/master/benchmarks/magnetometer/screenshot1.png"><img src="http://gitlab.onelab.info/getdp/getdp/raw/master/benchmarks/magnetometer/screenshot1_512.png" width="100%"></a>
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 <a href="http://gitlab.onelab.info/getdp/getdp/raw/master/benchmarks/magnetometer/screenshot2.png"><img src="http://gitlab.onelab.info/getdp/getdp/raw/master/benchmarks/magnetometer/screenshot2_512.png" width="100%"></a>
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+Download <a href="http://onelab.info/files/magnetometer.zip">model archive (magnetometer.zip)</a><br>
 Browse <a href="http://gitlab.onelab.info/getdp/getdp/tree/master/benchmarks/magnetometer/">model files</a>
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+## Quick start
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+To run the model, open `magnetometer.pro` with Gmsh.
+
 ## Additional information
 
 This is a 3D, multiphysics