Add link to draft version of specification

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 # Documentation
 
+A draft version of the specification is available at <https://ftp.libre-soc.org/power-spec-draft.pdf>
+
 ## Codebase Structure
 
 The SOC is partitioned into three repositories. The subrepositories are intended as standalone projects useful outside of LibreSOC. For example, the IEE754 FPU repository is a general purpose IEEE754 toolkit for the construction of FSMs and arbitrary length pipelines.