compliance: #27 - method and reproduction notes.

 On branch dev/next-release
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	modified:   tests/compliance/README.md

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	modified:   extern/riscv-compliance (modified content)
	modified:   extern/riscv-gnu-toolchain (modified content, untracked content)
	modified:   extern/riscv-isa-sim (modified content)
	modified:   extern/sail-riscv (modified content, untracked content)