docs(CHANGELOG.md): add release note for v1.2.0

Signed-off-by: Bofu Chen (bafu) <bofu@numbersprotocol.io>

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [v1.2.0] - 2023-07-27
+
+### Added
+
+1. Add asset management utilities.
+
+## [v1.0.0] - 2023-05-17
+
+### Added
+
+1. Utility scripts for helping users from creating Capture Account to registering committing digital assets.
+
+    Customizd scripts
+    * nit-api-commit.sh: Add commit to registerd file. Add DDEX (music metadata) specific keys in the custom field in metadata
+
+[v1.2.0]: https://github.com/numbersprotocol/capture-sdk/compare/v1.0.0...v1.2.0
+[v1.0.0]: https://github.com/numbersprotocol/capture-sdk/releases/tag/v1.0.0