Synth Data MCMOT

* Add README.md file with basic information about the repository
* Add license information in re-use format
* Add Blender files for the 3D models
* Add Python source code for the dataset generation

Co-authored-by: Tom Stein <tom.stein@iml.fraunhofer.de>
Co-authored-by: Leona Cerimi <leona.cerimi@iml.fraunhofer.de>
Co-authored-by: Christian Pionzewski <christian.pionzewski@iml.fraunhofer.de>
Co-authored-by: Oleg Belov <oleg.belov@iml.fraunhofer.de>
Co-authored-by: Antonia Ponikarov <antonia.ponikarov@iml.fraunhofer.de>
Co-authored-by: Oliver Urbann <oliver.urbann@iml.fraunhofer.de>
Co-authored-by: Nico Lindemann <nico.lindemann@iml.fraunhofer.de>