Add draft README.md without code owner

Code owners for the CloudFoundry module are yet to be
determined.

Signed-off-by: Karsten Schnitter <[email protected]>

Author: KarstenSchnitter

cloudfoundry-resource/README.md

@@ -0,0 +1,27 @@
+# OpenTelemetry CloudFoundry Resource Support
+
+This module contains CloudFoundry resource detectors for OpenTelemetry.
+
+The module detects environment variable `VCAP_APPLICATION`, which is present for applications deployed in CloudFoundry.
+This variable contains a JSON structure, which is parsed to fill the following attributes.
+
+| Resource attribute           | `VCAP_APPLICATION` field |
+|------------------------------|--------------------------|
+| cloudfoundry.app.id          | application_id           |
+| cloudfoundry.app.name        | application_name         |
+| cloudfoundry.app.instance.id | instance_index           |
+| cloudfoundry.org.id          | organization_id          |
+| cloudfoundry.org.name        | organization_name        |
+| cloudfoundry.process.id      | process_id               |
+| cloudfoundry.process.type    | process_type             |
+| cloudfoundry.space.id        | space_id                 |
+| cloudfoundry.space.name      | space_name               |
+
+The resource attributes follow the [CloudFoundry semantic convention.](https://github.com/open-telemetry/semantic-conventions/blob/05b4c173bfdee2e972d252d14593b9fb653cc54a/docs/attributes-registry/cloudfoundry.md).
+A description of `VCAP_APPLICATION` is available in the [CloudFoundry documentation](https://docs.cloudfoundry.org/devguide/deploy-apps/environment-variable.html#VCAP-APPLICATION).
+
+## Component owners
+
+- TBD
+
+Learn more about component owners in [component_owners.yml](../.github/component_owners.yml).