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Description
As a follow-up from #846 review this PR adds an initial documentation for CBLAS interface with 64 extended API.
The document style is aligned with https://github.com/Reference-LAPACK/lapack/blob/master/DOCS/lapacke.pdf but for better readability/maintenance on the GitHub it's implemented in Markdown.
The document preview: https://github.com/mkrainiuk/lapack/blob/master/DOCS/CBLAS.md