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add a contributing doc
See https://github.com/mvdan/sh/pull/687#issuecomment-804102521.
This should cover, for example, what makes testing these packages special, e.g. specific bash/mksh versions needed.
We should also cover other aspects, taking ideas from https://github.com/burrowers/garble/blob/master/CONTRIBUTING.md.
cc @lollipopman