doc: add labels documentation.

.github/MAINTAINER.md

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+# Maintainers
+
+## Labels
+
+If we open/look an issue/PR, we must add a `king/*` and an `area/*`.
+
+### Contributor
+
+* `contributor/need-more-information`: we need more information from the contributor in order to analyze a problem.
+* `contributor/waiting-for-corrections`: we need the contributor to take actions in order to move forward with a PR. **(only for PR)**
+* `contributor/needs-rebase`: use it only when there is some conflicts (and an automatic rebase is not possible). **(only for PR)** _[bot, humans]_
+
+### Kind
+
+* `kind/enhancement`: a new or improved feature.
+* `kind/question`: It's a question. **(only for issue)**
+* `kind/proposal`: proposal PR/issues need a public debate.
+  * _Proposal issues_ are design proposal that need to be refined with multiple contributors.
+  * _Proposal PRs_ are technical prototypes that need to be refined with multiple contributors.
+
+* `kind/bug/possible`: if we need to analyze to understand if it's a bug or not. **(only for issues)** _[bot only]_
+* `kind/bug/confirmed`: we are sure, it's a bug. **(only for issues)**
+* `kind/bug/fix`: it's a bug fix. **(only for PR)**
+
+### Resolution
+
+* `resolution/duplicate`: it's a duplicate issue/PR.
+* `resolution/declined`: Rule #1 of open-source: no is temporary, yes is forever.
+* `WIP`: Work In Progress. **(only for PR)**
+
+### Platform
+
+* `platform/windows`: Windows related.
+
+### Area
+
+* `area/provider`: related to all providers.
+* `area/provider/boltdb`: Boltd DB related.
+* `area/provider/consul`: Consul related.
+* `area/provider/docker`: Docker and Swarm related.
+* `area/provider/ecs`: ECS related.
+* `area/provider/etcd`: Etcd related.
+* `area/provider/eureka`: Eureka related.
+* `area/provider/k8s`: Kubernetes related.
+* `area/provider/marathon`: Marathon related.
+* `area/provider/mesos`: Mesos related.
+* `area/provider/rancher`: Rancher related.
+* `area/provider/zk`: Zoo Keeper related.
+* `area/middleware`: Middleware related.
+* `area/acme`: ACME related.
+* `area/authentication`: Authentication related.
+* `area/api`: Traefik API related.
+* `area/logs`: Traefik logs related.
+* `area/sticky-session`: Sticky session related.
+* `area/websocket`: WebSocket related.
+* `area/webui`: Web UI related.
+* `area/infrastructure`: related to CI or Traefik building scripts.
+* `area/documentation`: regards improving/adding documentation.
+
+### Priority
+
+* `priority/P0`: needs hot fix. **(only for issue)**
+* `priority/P1`: need to be fixed in next release. **(only for issue)**
+* `priority/P2`: need to be fixed in the future. **(only for issue)**
+* `priority/P3`: maybe. **(only for issue)**
+
+### PR size
+
+* `size/S`: small PR. **(only for PR)** _[bot only]_
+* `size/M`: medium PR. **(only for PR)** _[bot only]_
+* `size/L`: Large PR. **(only for PR)** _[bot only]_
+
+### Status - Workflow
+
+The `status/*` labels represent the desired state in the workflow.
+
+* `status/0-needs-triage`: all new issue or PR have this status. _[bot only]_
+* `status/1-needs-design-review`: need a design review. **(only for PR)**
+* `status/2-needs-review`: need a code/documentation review. **(only for PR)**
+* `status/3-needs-merge`: ready to merge. **(only for PR)**
+
+Note:
+* The status `needs-design-review` is only used in complex/heavy PRs.
+* From `1` to `2`: 2 design LGTM needed in comment.
+* From `2` to `3`: PR need 2 approvals.