Add CHANGELOG.md

Author: Disasm

CHANGELOG.md

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+# Change Log
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](http://keepachangelog.com/)
+and this project adheres to [Semantic Versioning](http://semver.org/).
+
+## [Unreleased]
+
+### Added
+
+- Added `riscv32i-unknown-none-elf` target support
+- Added user trap setup and handling registers
+- Added write methods for the `mip` and `satp` registers
+- Added `mideleg` register
+- Added Changelog
+
+### Changed
+
+- Fixed MSRV by restricting the upper bound of `bare-metal` version
+
+[Unreleased]: https://github.com/rust-embedded/riscv/compare/v0.5.4...HEAD