Add CHANGELOG.md

Author: Disasm

riscv-rt/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
+
+- Assure address of PC at startup
+- Implement interrupt and exception handling
+- Add support for the `riscv32i-unknown-none-elf` target
+- Added Changelog
+
+### Fixed
+
+- Fix linker script compatibility with GNU linker
+
+### Changed
+
+- Move `abort` out of the `.init` section
+- Update `r0` to v1.0.0
+- Set MSRV to 1.38
+
+
+[Unreleased]: https://github.com/rust-embedded/riscv-rt/compare/v0.6.1...HEAD