feat(sake): add spec

[kattouf]

Added new spec for sake tool - https://github.com/kattouf/Sake
Documentation

p.s. reopen pr without some mess in commits

[withfig-bot]

Overview

src/sake.ts:

Info:

[withfig-bot]

Hello @kattouf,
thank you very much for creating a Pull Request!
Here is a small checklist to get this PR merged as quickly as possible:

• Do all subcommands / options which take arguments include the args property (args: {})?
• Are all options modular? E.g. -a -u -x instead of -aux
• Have all other checks passed?

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