Create CONTRIBUTING.md

docs/CONTRIBUTING.md

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+<!--
+This is a default contributing guide that applies to the entire testdouble organization.
+It may be overridden by a repo-specific contributing guide.
+https://docs.github.com/en/communities/setting-up-your-project-for-healthy-contributions/creating-a-default-community-health-file
+-->
+
+# Contributing
+
+<!--
+TODO:
+
+fill out some generic contributing guidelines.
+The contents of this file should be fairly generic as they will apply (by default) to all testdouble repos that don't have their own CONTRIBUTING file.
+
+Probably some generic verbiage around accepting PRs;
+whether we have an AI policy;
+preference for tests and desire for simplicity, proof of value (does the value provided outweigh any additional complexity, etc)
+
+It is useful for this document to serve two audiences:
+1) external contributors (who may or may not be first time contributors)
+2) but also as "internal" documentation for the maintainers (ie how to trigger/publish releases, etc)
+
+I would propose that we have our testdouble recommendations for publishing/releasing to be documented here (fairly generically; again, this will be the default contributing doc for any testdouble repo that doesn't have its own.)
+-->