Add wasm build instructions and fdtd3dbench target with predefined co… #47

Job	Run time
Unit test arm ubuntu 22.04 for layout	1h 25m 30s
Unit test arm ubuntu 22.04 for grid	10m 32s
Unit test arm ubuntu 22.04 for layout	1h 25m 52s
Unit test arm ubuntu 22.04 for dumpers-loaders	11m 1s
Unit test arm ubuntu 22.04 for layout	1h 27m 10s
Unit test arm ubuntu 22.04 for coordinate	8m 33s
Unit test arm ubuntu 22.04 for layout	1h 25m 23s
Unit test arm ubuntu 22.04 for settings	8m 22s
Unit test arm ubuntu 22.04 for internalscheme	28m 18s
Unit test arm ubuntu 22.04 for approximation	8m 44s
Unit test arm ubuntu 22.04 for internalscheme	26m 10s
Unit test arm ubuntu 22.04 for complex	7m 54s
Unit test arm ubuntu 22.04 for internalscheme	28m 43s
Unit test arm ubuntu 22.04 for internalscheme	26m 55s
	8h 29m 7s

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