v_Tiddia2022: Create .gitignore

This version of the repository is the one used for the following work:

Tiddia G, Golosio B, Albers J, Senk J, Simula F, Pronold J, Fanti V, Pastorelli E, Paolucci PS and van Albada SJ (2022) Fast Simulation of a Multi-Area Spiking Network Model of Macaque Cortex on an MPI-GPU Cluster. Front. Neuroinform. 16:883333. doi: 10.3389/fninf.2022.883333