FEDM v1.0.0

The initial version of the FEDM code introduced and verified in the article:
Aleksandar P. Jovanović, Detlef Loffhagen, Markus M. Becker 2023 Introduction and verification of FEDM, an open-source FEniCS-based discharge modelling code Plasma Sources Sci. Technol. in press https://doi.org/10.1088/1361-6595/acc54b.