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Add the basic developer's documentation for the Wasm port (#9430) #2598

Job	Run time
Android / Android	11m 54s
Make / Make (PS Vita)	9m 51s
Make / Make (Emscripten)	3m 56s
Make / Make (Linux x86-64 SDL2 Release)	3m 4s
Make / Make (Linux x86-64 SDL2 Debug)	3m 19s
Make / Make (Nintendo Switch)	3m 16s
Make / Make (Linux ARM64 SDL2 Release)	4m 56s
MSVC / MSVC (SDL2 x86)	4m 19s
MSVC / MSVC (SDL2 x64)	4m 15s
SonarCloud Analyzer / SonarCloud Analyzer	4m 11s
Make / Make (Linux ARM64 SDL2 Debug)	5m 16s
Make / Make (macOS SDL2)	2m 34s
Make / Make (macOS SDL2 App Bundle)	1m 40s
Translation update / Translation update	20s
	1h 2m 51s

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