Create release-note.md

Documentation_website/docs/General/release-note.md

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+# Introduction
+As of XXX the endorsed ONE Record version is:
+- Ontology 3.1.0
+- API 2.1.0
+
+Following IATA governance, this ONE Record release has been endorsed by COTB and by the CSC.
+
+# Ontology 3.1.0
+## General information
+
+Ontology 3.1.0 brings many changes compared to 3.0.0. Those changes do not alter the overall object structure but many properties were adjusted based on discussions that have happened in 2024 among the Data Model taskforce and the sub-group dedicated to ONE Record <> CXML mapping.
+
+## Changelog
+https://github.com/IATA-Cargo/ONE-Record/pull/242
+https://github.com/IATA-Cargo/ONE-Record/pull/243
+https://github.com/IATA-Cargo/ONE-Record/pull/258
+https://github.com/IATA-Cargo/ONE-Record/pull/273