Add CHANGELOG.md

CHANGELOG.md

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+# Changelog
+
+## [Unreleased]
+
+### Added
+
+- Added `PartialEq` impls for `CStr16 == CStr16`, `&CStr16 == CString`,
+  anded `CString == &CStr16`.
+- Added `Display` impl for `CString16`.
+- Added `Handle::from_ptr` and `SystemTable<View>::from_ptr`, which are
+  `unsafe` methods for initializing from a raw pointer.
+
+### Changed
+
+- `File::open` now takes the filename as `&CStr16` instead of `&str`,
+  avoiding an implicit string conversion.
+
+### Removed
+
+- Removed `CStr16::as_string` method. Use
+  [`ToString`](https://doc.rust-lang.org/alloc/string/trait.ToString.html)
+  instead.
+
+### Fixed
+
+- Fixed compilation with Rust 1.60 by no longer enabling the
+  `vec_spare_capacity` feature, which has been stabilized.
+- Fixed the header size calculated by `FileInfo::new` and
+  `FileSystemInfo::new`.