review REQUIRED.md files

minor MD lint fixes, add placeholder code.json.

TODO: code.json must be updated with version/release tag and DOI. see ghsc/nshmp/nshm-hawaii#1

See ghsc/nshmp/nshmp-haz-v2#464

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• 92665a57 - cleanup READMEs

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marked this merge request as draft

changed milestone to %nshmp-haz 2.0 II

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• 462e70f2 - standardize files, fix URLs, clean up

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changed the description

marked this merge request as ready

mentioned in commit 0b01308c

merged