changelog: Add initial.

CHANGELOG

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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/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Added
+
+- Initial Bitcoin ledger that supports basic transaction management
+  - Input output check
+  - Address based UTXO management
+- Initial RpcApi trait implementation
+  - send_raw_transaction
+  - get_raw_transaction
+  - get_raw_transaction_info
+  - get_transaction
+  - send_to_address: Sends the amount to address, regardless of the balance
+  - get_new_address
+  - generate_to_address
+  - get_balance
+
+[unreleased]: https://github.com/chainwayxyz/bitcoin-mock-rpc