* init commit for distirbuted examples
* better OOB protection
* and try import to nvshmem for better error message and a READMME.md to introduce nvshmem and multimem instructions
* add some lamport explanation
* enhance f8 output and warn that f8 output can have nan in it
* tell user why we need complicate data conversions in ref check part
* tell user we don't support nvshmem device function
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Co-authored-by: bangyus <bangyus@nvidia.com>