build scripts README.md

[tpepper]

The https://github.com/kubernetes/release/tree/master/build subdirectory of scripts needs a README.md describing the tools, example invocations, expected outputs, tests.

[justaugustus]

/priority important-soon
/milestone v1.16
/kind documentation

[hoegaarden]

#825 would address parts of it, by moving all the image related stuff into a separate directory which has a README

[fejta-bot]

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[justaugustus]

/remove-lifecycle stale
/milestone v1.18