feat: Add CHANGELOG.md to track changes

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]
+
+## [0.0.1] - 2022-07-15
+### Added
+- Create cli tool able to set up a Ethereum based validator in an on-premise way.
+- Generate `docker-compose` scripts and `.env` files for selected clients with the `cli` command.
+- Generate keystore folder with the cli using `keys` command. The inner tool used for this is the [staking-deposit-cli](https://github.com/ethereum/staking-deposit-cli) tool.
+- Generate `jwtsecret` for post-merge networks.
+- Test coverage (unit tests)
+- Integrate Kiln network
+- Integrate Ropsten network
+- Integrate MEV-Boost as an option