Cross Build Tests

Convert all README's to markdown files. #195

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Run time

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Job	Run time
QEMU Linux s390x	1m 36s
QEMU Linux PPC64	1m 50s
QEMU Linux Mips64el	1m 42s
[BUILD ONLY] Android 35 (arm64_v8a) NDK 29	1m 23s
	6m 31s