Continuity equation and fundamental diagram of pedestrians (#242)

Implementation of a novel method computing the fundamental diagram of pedestrians. The method is described in Adrian et al, 2024, Continuity equation and fundamental diagram of pedestrians (https://arxiv.org/pdf/2409.11857).
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Co-authored-by: schroedtert <t.schroedter@posteo.de>
Co-authored-by: ThoChat <83350421+ThoChat@users.noreply.github.com>
Co-authored-by: Mohcine Chraibi <m.chraibi@fz-juelich.de>

Author: 4 people

docs/source/fundamental_diagram_at_measurement_line.ipynb

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+../../notebooks/fundamental_diagram_at_measurement_line.ipynb