motivation: make sure examples are up tp date
changes:
* use swift:5.2 images instead of nighlies
* compute dependencies to make zipfile as small as possible
* make scripts more consistent
motivation: cleanup docs for oss
changes:
* add useful information in readme, with pointers to examples
* update ci setup and example to use latest tools
* update contributors list
Co-authored-by: Yim Lee <yim_lee@apple.com>
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