docs

* Structure for GPU project and configurations for Gray-Scott

* Fixed GS initial conditions in spectral mode

* Added Game-of-Life adjacent configuration for Gray-Scott

* Blobs evolving in different directions

* Added USkate world configuration for Gray-Scott

* Added script for scaling tests

* Changed configurations a bit

* Changed configurations

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* Changed configs

* Added readme for GPU project

* Implemented node limit in scaling

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Co-authored-by: Thomas <t.baumann@fz-juelich.de>