Add CHANGELOG.md.

Signed-off-by: Daira-Emma Hopwood <[email protected]>

CHANGELOG.md

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+# Changelog
+
+All notable changes to this library will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
+
+This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [0.1.0] - 2024-08-27
+
+### Changed
+- The peer protocol version used by the seeder has been updated for the NU6 testnet.
+- The README now calls this project `zcash-seeder` rather than `bitcoin-seeder`.
+
+## [0.0.0] - 2022-12-29
+
+There were previously no formal releases. The last change was to update the required
+peer protocol version after NU5 activation on mainnet.