Merge pull request #201 from galaxyproject/maintainership

Add an explicit contributing section about governance and maintainership

Author: nuwang

CONTRIBUTING.md

@@ -6,3 +6,21 @@ contribution guidelines as the Galaxy application.
 
 For details, please look at [Galaxy Contributing
 document](https://github.com/galaxyproject/galaxy/blob/dev/CONTRIBUTING.md).
+
+## Governance and maintainership
+
+TPV and the shared tool resource registry are maintained by Galaxy community
+maintainers, with a designated set of registry maintainers responsible for
+curation of registry entries.
+
+All substantive changes are proposed through pull requests and reviewed before
+merge by maintainers; changes that affect deployment behavior should include
+input from Galaxy deployment operators.
+
+Galaxy deployment operators are encouraged to participate by opening issues,
+submitting pull requests, and reviewing/testing proposals against real-world
+infrastructure constraints.
+
+Registry recommendations are accepted via pull request after maintainer review,
+with preference for recommendations supported by production evidence,
+benchmarking data, or operator validation.