Add files for Mulliken tests in stdout-charges

tests/sisl/io/siesta/stdout-charges/README.md

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+This folder contains a collection of output files with different charges (Mulliken, Hirshfeld, Voronoi), necessary for the testing of the charge parsing routines in the `stdoutSileSiesta` class.
+
+The logic behind the naming convention of the files is,
+`_md`: The charges are written at each molecular dynamics step
+`_scf`: The charges are written at each SCF step
+`_pol`: Spin polarized (colinear spin)
+`_nc`: Non-colinear spin
+`_soc`: Spin-orbit coupling
+
+All tests were run with Siesta-5.0.0-beta1 (https://gitlab.com/siesta-project/siesta/-/releases/5.0.0-beta1) with pseudopotential files in the PSML format taken from the PseudoDojo (NC FR (ONCVPSP v0.4), PBE, standard).

tests/sisl/io/siesta/stdout-charges/mulliken_voronoi_hirshfeld_md/mulliken_voronoi_hirshfeld_md.fdf

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+LatticeConstant 1.0 Ang
+%block LatticeVectors
+ 2.13000000 1.22975607 0.00000000
+ 2.13000000 -1.22975607 0.00000000
+ 0.00000000 0.00000000 14.20000000
+%endblock LatticeVectors
+NumberOfAtoms 2
+AtomicCoordinatesFormat Ang
+%block AtomicCoordinatesAndAtomicSpecies
+ 0.00000000 0.00000000 0.00000000 1 # 1: C
+ 1.38000000 0.00000000 0.00000000 1 # 2: C
+%endblock AtomicCoordinatesAndAtomicSpecies
+NumberOfSpecies 1
+%block ChemicalSpeciesLabel
+ 1 6 C
+%endblock ChemicalSpeciesLabel
+MD.TypeOfRun cg
+MD.Steps 2
+WriteHirshfeldPop t
+WriteVoronoiPop t
+PartialChargesAtEveryGeometry t
+#PartialChargesAtEverySCFStep t
+WriteMullikenPop 1
+Write.DMHS.History.NetCDF t