Hyperlint readme (#16483)

* Hyperlint readme

* Update .hyperlint/README.md

Co-authored-by: Kody Jackson <[email protected]>

* Update .hyperlint/README.md

Co-authored-by: Kody Jackson <[email protected]>

* Update README.md

* Update .hyperlint/README.md

Co-authored-by: Kody Jackson <[email protected]>

* Update README.md again

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Co-authored-by: Kody Jackson <[email protected]>

Author: haleycode

.hyperlint/README.md

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+## Hyperlint
+
+Hyperlint is a tool that enables us to automatically check if contributions to the docs adhere to our style guide. More info on how the tool works is available on the Hyperlint site: https://hyperlint.com/
+
+#### Custom Vale rules
+We have several custom Vale rules that trigger Hyperlint suggestions located in our [custom Vale styles](https://github.com/cloudflare/cloudflare-docs/tree/production/.github/styles/cloudflare).
+
+To report issues with them (or a new one entirely), open an issue in our repo.
+
+#### Specific vocabularies
+
+Instead of creating a long blocklist, we instead opted for an allowlist that can be expanded as use cases arise. New terms can be added to the allowlist file: .github/styles/config/vocabularies/cloudflare/accept.txt
+
+If you resolve all Hyperlint comments, your PR checks will automatically pass. If the checks are especially noisy and unhelpful, add a `hyperlint-ignore` label to your PR and alert PCX to the flag.
+