new issue template

.github/ISSUE_TEMPLATE/new-integration-proposal copy.md

@@ -0,0 +1,20 @@
+---
+name: Breaking change proposal
+about: Track a breaking change for an existing integration
+title: ''
+labels: breaking change
+assignees: ''
+
+---
+
+## Summary and motivation
+
+Briefly explain how the change is breaking and why is needed.
+
+## Checklist
+
+- [ ] The change is documented with docstrings and was merged in the `main` branch
+- [ ] Integration tile on https://github.com/deepset-ai/haystack-integrations was updated
+- [ ] Docs at https://docs.haystack.deepset.ai/ were updated
+- [ ] Notebooks on https://github.com/deepset-ai/haystack-cookbook were updated (if needed)
+- [ ] New package version declares the breaking change and package has been released on PyPI