Merge pull request #1007 from breedx-splk/add_splunk_to_readme

Add Splunk to the README

Author: pivotal-david-osullivan

README.md

@@ -140,6 +140,7 @@ The buildpack supports extension through the use of Git repository forking. The
   * [Riverbed AppInternals Agent](docs/framework-riverbed_appinternals_agent.md) ([Configuration](docs/framework-riverbed_appinternals_agent.md#configuration))
   * [Sealights Agent](docs/framework-sealights_agent.md) ([Configuration](docs/framework-sealights_agent.md#configuration))
   * [Seeker Security Provider](docs/framework-seeker_security_provider.md) ([Configuration](docs/framework-seeker_security_provider.md#configuration))
+  * [Splunk Observability Cloud](docs/framework-splunk_otel_java_agent.md) ([Configuration](docs/framework-splunk_otel_java_agent.md#user-provided-service))
   * [Spring Auto Reconfiguration](docs/framework-spring_auto_reconfiguration.md) ([Configuration](docs/framework-spring_auto_reconfiguration.md#configuration))
   * [Spring Insight](docs/framework-spring_insight.md)
   * [SkyWalking Agent](docs/framework-sky_walking_agent.md) ([Configuration](docs/framework-sky_walking_agent.md#configuration))