added rsts for all src files
doc/fluxes/numericalflux.rst
0 → 100644
doc/fluxes/upwindflux.rst
0 → 100644
doc/kernels/isotropic.rst
0 → 100644
doc/kernels/isotropic1D.rst
0 → 100644
doc/problems/aircavity1d.rst
0 → 100644