add and update required files

Add and update required files (see nshmp-haz#464 (closed))

CONTRIBUTING.md is from nshmp-lib and is probably not appropriate here.

added 8 commits

• e21918f0...d4095f98 - 7 commits from branch ghsc/nshmp:main
• c53f2091 - Merge branch 'main' of https://code.usgs.gov/ghsc/nshmp/nshmp-ws-static into required-files

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You can remove contrib if it's not required.

added 1 commit

• 71850953 - apply changes as suggested in nshmp-apps!99 (merged)

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added 1 commit

• 16a9609b - updates as suggested for nshmp-apps!99 (merged)

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resolved all threads

enabled an automatic merge when the pipeline for 16a9609b succeeds

canceled the automatic merge

mentioned in commit c58f2b94

merged