Initial labels setup for Pezkuwi SDK

docs/.gitignore

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+book

docs/src/SUMMARY.md

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+# Summary
+
+[Home](HOME.md)
+
+- [Respositories](#)
+  - [Polkadot SDK](doc_polkadot-sdk.md)
+- [FAQ](faq.md)

docs/src/book.toml

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+[book]
+authors = ["Chevdor"]
+language = "en"
+multilingual = false
+src = "src"
+title = "Labels"
+
+[output.html]
+site-url = "/labels/"
+git-repository-url = "https://github.com/paritytech/labels"
+git-repository-icon = "fa-github"
+edit-url-template = "https://github.com/paritytech/labels/edit/main/{path}"

docs/src/faq.md

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+# FAQ
+
+## How is a label interpreted ?
+
+You may see labels defined as `S0-design`. It is made of a label code: `S`, a number: `0` and some description.
+The rules **only apply to the part of the label without the description and the label above will simply be considered as `S0`.
+Should the description change, the rules would remain unaffected.
+
+## What are rules ?
+
+Rules are defined in a YAML files and describe:
+- the name of the rule
+- the conditions of the rule (for instance, some rules only apply if a specific label is present)
+- the conditions for a set of labels to be valid. For instance, you will not be able to have `C1-low` and `C5-high` for a given PR. You will have to chose one or the other and the rules will enforce this
+
+## Where can I find the source of the rules ?
+
+Look for the `specs_<name>.yaml` files in [here](https://github.com/paritytech/labels/tree/main/ruled_labels).
+
+## Are there tests to check those rules ?
+
+Absolutly, look for the `tests_<name>.yaml` files in [here](https://github.com/paritytech/labels/tree/main/ruled_labels).
+
+## Where can I report issues/doubts I have about some rules ?
+
+You can open a new issue in the [labels repository](https://github.com/paritytech/labels/issues).
+
+## What happens when rules fail ?
+
+If you label your PR with an invalid set of labels, the CI will fail and tell you what the issue is.
+You can see an example [here](https://github.com/paritytech/cumulus/actions/runs/4362797055/jobs/7628115688) where a `B` label was missing.