release v2.0.0

See CHANGELOG for details

Signed-off-by: Mike Szczys <mike@golioth.io>

CHANGELOG.md

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+<!-- Copyright (c) 2024 Golioth, Inc. -->
+<!-- SPDX-License-Identifier: Apache-2.0 -->
+
+# 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/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [2.0.0] 2024-02-16
+
+### Added
+- Changelog
+- Code of Conduct
+
+### Changed
+- Use Golioth Firmware SDK (at v0.10.0)