Add package manifest for pulling HEU through UPM#21

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tlaedre wants to merge 2 commits intosideeffects:Houdini19.0from

tlaedre:Houdini19.0-add-package-manifest

Commits on Apr 12, 2022

Add package manifest for pulling HEU through UPM. Add Git installation instructions.
tlaedre
committed

Commits on Nov 17, 2022

Merge branch 'sideeffects:Houdini19.0' into Houdini19.0-add-package-manifest
tlaedre
authored