Mock Neutron raytracing openPMD data

Here a mock dataset in h5 format is uploaded, which complies with the openPMD format with the neutron raytracing extension which is under construction. The extension can be found here: https://github.com/PaNOSC-ViNYL/openPMD-standard/blob/domex_neutron_raytracing/EXT_NRAYTRACING.md The dataset is created manually, and serves as an example of a file that complies with the current version of the openPMD extension for neutron raytracing.The dataset includes particle states of 5000 neutrons after a neutron guide, which are generated with reasonable correlations between velocity, weight and time. The positions at the guide exit are random within a 3 by 8 cm^2 area. The neutron state includes: position (x,y,z) positionOffset (x,y,z) velocity(x,y,z) polarization (x,y,z) weights time The python script used to generate this data is included. This dataset is part of the Deliverable D5.1 in Workpackage 5 (Virtual Neutron and X-ray Laboratory) of the Photon and Neutron Open Science Cloud (PaNOSC). This project has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No. 823852.