Add OSSF badges (#160)

Author: trask

README.md

@@ -1,5 +1,9 @@
+[![Release](https://img.shields.io/github/v/release/open-telemetry/semantic-conventions-java?include_prereleases&style=)](https://github.com/open-telemetry/semantic-conventions-java/releases/)
+[![OpenSSF Scorecard](https://api.scorecard.dev/projects/github.com/open-telemetry/semantic-conventions-java/badge)](https://scorecard.dev/viewer/?uri=github.com/open-telemetry/semantic-conventions-java)
+[![OpenSSF Best Practices](https://www.bestpractices.dev/projects/10003/badge)](https://www.bestpractices.dev/projects/10003)
+[![Slack](https://img.shields.io/badge/slack-@cncf/otel--java-blue.svg?logo=slack)](https://cloud-native.slack.com/archives/C014L2KCTE3)
+
 # OpenTelemetry Semantic Conventions for Java
-[![Continuous Build][ci-image]][ci-url]
 
 Java code-generation for the [OpenTelemetry Semantic Conventions](https://github.com/open-telemetry/semantic-conventions).