That is nice but that doesn't answer my question convening life itself. Isn't understanding the first primitive cellar life the most fundamental to evolutionary theory? How did the first plant/animal cells "evolve"? So I think it is a fundamental question.
Darwin's theory doesn't concern the origin of life any more than Newton's theory concerns the origins of matter. Darwin's book was called The Origin of Species, not The Origin of Life. Since evolution of species depends on reproduction, evolution could not have caused the first living thing, any more than gravity could have formed the first atom of matter.
As to where the first life came from, Darwin did have an answer. From the last paragraph of The Origin of Species:
"There is grandeur in this view of life, with its several powers, having been originally breathed by the Creator into a few forms or into one; and that, whilst this planet has gone cycling on according to the fixed law of gravity, from so simple a beginning endless forms most beautiful and most wonderful have been, and are being, evolved."