added notation CLI reference docs based on RC4

[zr-msft]

fixes #163

[netlify]

✅ Deploy Preview for notarydev ready!

Name	Link
🔨 Latest commit	bc30d5e
🔍 Latest deploy log	https://app.netlify.com/sites/notarydev/deploys/64497e548cf3ea00078d55b8
😎 Deploy Preview	https://deploy-preview-183--notarydev.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site settings.

[yizha1]

LGTM.
@zr-msft One question: I didn't see sub-commands for notation sign and notation verify. Do you plan to add them later?

[FeynmanZhou]

@zr-msft Could you add a code block effect for each CLI command example like https://oras.land/cli_reference/? It would be much more convenient for users to copy. We will also add a Copy button to the code block soon. The layout will be much more comfortable if we put the example CLI command in the code block.

[FeynmanZhou]

@yizha1 There are reference docs for notation sign and notation verify:

https://deploy-preview-183--notarydev.netlify.app/docs/cli-reference/notation_sign/
https://deploy-preview-183--notarydev.netlify.app/docs/cli-reference/notation_verify/

[zr-msft]

manually added code blocks to examples for now. Still need to research better automated generation of these changes, but thats out of scope for this PR

[FeynmanZhou]

LGTM

[yizha1]

LGTM for a first version