doc/release-notes: init 26.05 release notes

doc/release-notes/rl-2605.section.md

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+# Nixpkgs 26.05 (2026.05/??) {#sec-nixpkgs-release-26.05}
+
+## Highlights {#sec-nixpkgs-release-26.05-highlights}
+<!-- To avoid merge conflicts, consider adding your item at an arbitrary place in the list instead. -->
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+## Backward Incompatibilities {#sec-nixpkgs-release-26.05-incompatibilities}
+
+<!-- To avoid merge conflicts, consider adding your item at an arbitrary place in the list instead. -->
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+
+## Other Notable Changes {#sec-nixpkgs-release-26.05-notable-changes}
+
+<!-- To avoid merge conflicts, consider adding your item at an arbitrary place in the list instead. -->
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+
+## Nixpkgs Library {#sec-nixpkgs-release-26.05-lib}
+
+<!-- To avoid merge conflicts, consider adding your item at an arbitrary place in the list instead. -->
+
+### Breaking changes {#sec-nixpkgs-release-26.05-lib-breaking}
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+
+
+### Deprecations {#sec-nixpkgs-release-26.05-lib-deprecations}
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+
+### Additions and Improvements {#sec-nixpkgs-release-26.05-lib-additions-improvements}
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