chakra-core organizational miscellanea

Various organizational content (meetings, previews, etc)

Name		Name	Last commit message	Last commit date
Latest commit History 10 Commits
ChakraCore Future Plan.md		ChakraCore Future Plan.md
Meeting Agenda 25-05-20.md		Meeting Agenda 25-05-20.md
README.md		README.md
Release 1.12 plan.md		Release 1.12 plan.md
tc39 Proposals.md		tc39 Proposals.md

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