add bit about command line

[todo]

prf-explainer/julia/README.md

Lines 47 to 49 in 0aacae6

	- @todo: add bit about command line
	- @todo: use of `BenchmarkTools.jl` for getting good timing info

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This issue was generated by todo based on a todo comment in 0aacae6. It's been assigned to @schluppeck because they committed the code.