Add repository-settings.md (#167)

Author: trask

.github/repository-settings.md

@@ -0,0 +1,6 @@
+# Repository settings
+
+Same
+as [opentelemetry-java-instrumentation repository settings](https://github.com/open-telemetry/opentelemetry-java-instrumentation/blob/main/.github/repository-settings.md#repository-settings),
+except that the rules for `v0.*`, `v1.*`, `gh-pages`, and `cloudfoundry` branches
+are not relevant in this repository.