documentation: Add readme on tests and loader versioning #15

Job	Run time
build-clang-linux (ubuntu:24.04, dynamic)	9m 14s
build-clang-linux (ubuntu:24.04, static)	4m 25s
build-clang-linux (ubuntu:22.04, dynamic)	8m 40s
build-clang-linux (ubuntu:22.04, static)	5m 10s
	27m 29s

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