Update Documentation/README.md to cover more files. #928
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Update Documentation/README.md to cover the Proposals and ABI directories.
I have also copied my forum post regarding #162 and #840 into a Markdown document, but haven't added it to README.md as it's prospective only and hasn't been accepted as either a vision document nor formal proposal.
I have also deleted Releases.md as obsolete now that our releases are tied to the Swift project's releases.
Checklist: