add out-of-date

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 # Variable-width Variable-packed SIMD / Simple-V / Parallelism Extension Proposal
 
+**Note: this document is out of date and involved early ideas and discussions**
+
 Key insight: Simple-V is intended as an abstraction layer to provide
 a consistent "API" to parallelisation of existing *and future* operations.
 *Actual* internal hardware-level parallelism is *not* required, such