Release Notes Template

Author: slaskawi

docs/RELEASE_NOTES_TEMPLATE.md

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+# MongoDB Community Operator x.y.z
+
+> See the internal "Release Note Authoring Guidance" Wiki page for details
+
+## Warnings
+
+> Put here anything that user needs to know to use this version. In most cases, this section will be empty and removed.
+
+## New features, improvements and bug fixes
+
+> Mention shipped things in this particular order. In any improvements need migration guides, please include them here as well.
+
+## Deprecations and removals
+
+> First deprecations and then removals.