Add a "Why?" section to the README.md with pros and cons. #59

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Run time

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Job	Run time
Rustfmt	23s
Test (ubuntu)	4m 10s
Test (i686-linux)	6m 8s
Test (aarch64-linux)	9m 32s
Test (riscv64-linux)	12m 11s
	32m 24s