chore: Add CHANGELOG.md

Author: Detoo

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).
+
+## [Unreleased]
+
+### Added
+
+- src/implants/sudoImplant.sol
+  - A Module (implant) for enforcing BORG, DAO co-approvals on Safe admin operations such as toggling Modules or setting Guards
+
+- src/libs/governance/snapShotExecutor.sol
+  - An off-chain (snapshot) voting coordinator contract that enforces BORG, DAO co-approvals on proposals
+
+- scripts/yearnBorg.s.sol
+  - Scripts for deploying Yearn BORG contracts
+
+### Updated
+
+- src/borgCore.sol
+  - Blocks delegate calls by default in blacklist mode and allow whitelisting specific contracts
+  - Maintains the same behaviors in whitelist mode
+
+- src/implants/ejectImplant.sol
+  - Allows admin to allow/disallow a member to reduce threshold when resigning