Additional documentation (idaholab#367)

doc/content/source/auxkernels/MDGranularPorosityAux.md

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+# MDGranularPorosityAux
+
+!syntax description /AuxKernels/MDGranularPorosityAux
+
+Computes porosity $\phi$ or packing fraction $1 - \phi$ and injects it into and aux variable.
+The packing fraction is obtained from an `MDRunBase` object. The `MDRunBase` object needs
+to operate in `granular` mode which is triggered by providing the `radius` property
+in the `md_particle_properties` parameter.
+
+!syntax parameters /AuxKernels/MDGranularPorosityAux
+
+!syntax inputs /AuxKernels/MDGranularPorosityAux
+
+!syntax children /AuxKernels/MDGranularPorosityAux
+
+!bibtex bibliography

doc/content/source/auxkernels/MDGranularPropertyAux.md

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+# MDGranularPropertyAux
+
+!syntax description /AuxKernels/MDGranularPropertyAux
+
+Injects properties collected for MD particles from MDRunBase object user_object into auxiliary variable.
+The properties are obtained from an `MDRunBase` object. The list of available properties is:
+velocity in $x, y, z$ `vel_x`, `vel_y`, `vel_z`; force in $x, y, z$ `force_x`, `force_y`, `force_z`;
+charge, and radius.
+
+!syntax parameters /AuxKernels/MDGranularPropertyAux
+
+!syntax inputs /AuxKernels/MDGranularPropertyAux
+
+!syntax children /AuxKernels/MDGranularPropertyAux
+
+!bibtex bibliography