What this MR does / why does DuMux need it:
A new documented example for a 1D-3D multi-domain problem simulating tracer transport in a porous medium with embedded transport network.
Notes for the reviewer
Preview documentation here: https://git.iws.uni-stuttgart.de/dumux-repositories/dumux/-/blob/feature/example-1d3d/examples/embedded_network_1d3d/README.md
Not all header files have been added to the documentation so far (e.g.
solver.hh are excluded). I wanted to focus on the main parts. This can be extended in the future.
Before you request a review from someone, make sure to revise the following points:
\n character. Make sure there is no
\ No newline at end of file comment in "Changes" of this MR.