Add wasm build instructions and fdtd3dbench target with predefined co… #26

Job	Run time
Unit test ppc64el ubuntu 22.04 for internalscheme (ON, ON)	29m 58s
Unit test ppc64el ubuntu 22.04 for internalscheme (ON, OFF)	29m 58s
Unit test ppc64el ubuntu 22.04 for internalscheme (OFF, ON)	31m 11s
Unit test ppc64el ubuntu 22.04 for internalscheme (OFF, OFF)	30m 14s
Unit test ppc64el ubuntu 22.04 for layout (ON, ON, f)	1h 0m 56s
Unit test ppc64el ubuntu 22.04 for layout (ON, ON, d)	50m 27s
Unit test ppc64el ubuntu 22.04 for layout (ON, OFF, f)	1h 1m 12s
Unit test ppc64el ubuntu 22.04 for layout (ON, OFF, d)	51m 27s
Unit test ppc64el ubuntu 22.04 for layout (OFF, ON, f)	1h 0m 18s
Unit test ppc64el ubuntu 22.04 for layout (OFF, ON, d)	52m 42s
Unit test ppc64el ubuntu 22.04 for layout (OFF, OFF, f)	1h 0m 44s
Unit test ppc64el ubuntu 22.04 for layout (OFF, OFF, d)	49m 57s
Unit test ppc64el ubuntu 22.04 for grid	9m 12s
Unit test ppc64el ubuntu 22.04 for dumpers-loaders	13m 12s
Unit test ppc64el ubuntu 22.04 for coordinate	9m 55s
Unit test ppc64el ubuntu 22.04 for settings	7m 54s
Unit test ppc64el ubuntu 22.04 for approximation	9m 4s
Unit test ppc64el ubuntu 22.04 for complex	7m 41s
	10h 26m 2s

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