chore: assign Browser SIG Maintainers Approver-permissions for browser packages (#6093)

Author: pichlermarc

.github/CODEOWNERS

@@ -12,4 +12,19 @@
 #  https://help.github.com/en/articles/about-code-owners
 #
 
+# Only maintainers can approve changes in .github/ - including this file here, workflows and issue templates
+.github/ @open-telemetry/javascript-maintainers
+
+# Maintainers own the API packages: strict stability guarantees require extensive review
+api/ @open-telemetry/javascript-maintainers
+packages/experimental/api-logs/ @open-telemetry/javascript-maintainers
+
+# Any browser-specific code is co-owned by Browser SIG and JS SIG (list more packages here as needed):
+packages/opentelemetry-sdk-trace-web/ @open-telemetry/browser-maintainers @open-telemetry/javascript-approvers
+packages/experimental/opentelemetry-browser-detector/ @open-telemetry/browser-maintainers @open-telemetry/javascript-approvers
+packages/experimental/opentelemetry-instrumentation-fetch/ @open-telemetry/browser-maintainers @open-telemetry/javascript-approvers
+packages/experimental/opentelemetry-instrumentation-xml-http-request/ @open-telemetry/browser-maintainers @open-telemetry/javascript-approvers
+packages/experimental/opentelemetry-web-common/ @open-telemetry/browser-maintainers @open-telemetry/javascript-approvers
+
+# All other files
 * @open-telemetry/javascript-approvers

README.md

@@ -263,6 +263,9 @@ For more information about the maintainer role, see the [community repository](h
 - [Raphaël Thériault](https://github.com/raphael-theriault-swi), SolarWinds
 - [Svetlana Brennan](https://github.com/svetlanabrennan), New Relic
 
+In addition, [Browser SIG Maintainers](https://github.com/orgs/open-telemetry/teams/browser-maintainers) are granted the
+Approver role for browser-targeted packages as defined in this repository's [CODEOWNERS](./.github/CODEOWNERS) file.
+
 For more information about the approver role, see the [community repository](https://github.com/open-telemetry/community/blob/main/guides/contributor/membership.md#approver).
 
 ### Triagers