feat: add /access to API reference

[kheiner]

Adds Schema reference as well as the applicable CRUD options.

NOTE: I opted to clarify in filenames that they reference accessRules rather than trying to figure out how to pluralize accesses in a way that doesn't hurt my brain or stress my ability to verbalize it.

Fixes #40

I did not see any SDK commands for access so I noted that the SDK is not supported.
I don't know GraphQL well enough to see if it's not there, but I couldn't find it anywhere so I also noted it as not supported.

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I wanted to call attention to the following items as possible issues unrelated to this commit but discovered in the process

• scripts in package.json build and dev use Scalar presentation that does not match formatting/styling at directus.io/docs/api See Improve Contributor Experience: local dev environment && contributions.md ideas #64
• After Research, I found an explanation/clarity I was looking for... for posterity: Scalar output has %E2%80%8E appended to POST requests for create commands when using HTTP HTTP/1.1
  • create access rule & (previous example) create a policy
    • Note that this is not visible in the production deployment: https://directus.io/docs/api/policies#create-a-policy
  • It's difficult (impossible)? to detect in git diff Troubleshooting in another editor I was able to see the hidden characters:

Maybe the fix is to have a contribution guideline that explains it? I'm not the only one who was befuddled (see #46)