message: Add CircleCI to the Well Known Annotations
diff: @@ -158,6 +158,27 @@ fallback (`rollbar.organization` followed by `organization.name`).
  Specifying this annotation may enable Rollbar related features in Backstage for
  that entity.
  +### circleci.com/project-slug
  +
  +```yaml
  +# Example:
  +metadata:
  + annotations:
  + circleci.com/project-slug: github/spotify/pump-station
  +```
  +
  +The value of this annotation is the so-called slug (or alternatively, the ID) of
  +a [CircleCI](https://circleci.com/) project within your organization. The value
  +can be the format of `[source-control-manager]/[organization]/[project-slug]` or
  +just `[organization]/[project-slug]`. When the `[source-control-manager]` slug
  +is omitted, `bitbucket` will be used as a fallback.
  +
  +Specifying this annotation will cause the CI/CD features in Backstage to display
  +data from CircleCI for that entity.
  +
  +Providing both the `github.com/project-slug` and `circleci.com/project-slug`
  +annotations can cause problems as both may be used for CI/CD features.
  +
  ### backstage.io/ldap-rdn, backstage.io/ldap-uuid, backstage.io/ldap-dn
  ```yaml
  