Add a CHANGELOG.md

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 and this project adheres to Semantic Versioning.
+
+For all future releases, please manage versions as follows:
+
+1. Briefly summarize notable changes in this file (`CHANGELOG.md`). If the release includes *breaking changes*, provide clear migration instructions.
+2. Publish the new version on crates.io and create a new release on [GitHub Releases](https://github.com/kaist-cp/circ/releases).
+
+---
+
+## Version 0.2.0 - 2024-10-03
+
+### Features
+
+* Added implementation of standard traits for pointers. ([#3](https://github.com/kaist-cp/circ/pull/3))
+
+### Bug Fixes
+
+* `PartialEq` for `Rc` and `Snapshot` now compares the objects they point to, rather than the pointers themselves. ([#3](https://github.com/kaist-cp/circ/pull/3)) (See compatibility note below.)
+
+### Compatibility Notes
+
+* `Rc::eq` and `Snapshot::eq` now compare the objects they point to instead of their pointer values. This change aligns with the behavior of `PartialEq` for other smart pointer types (e.g., `std::rc::Rc`), where equality is based on the objects being pointed to. The original pointer-based comparison is still available via the `ptr_eq` method.
+  * **Migration**: To compare pointer values, use the `ptr_eq` method. 
+
+## Version 0.1.0 - 2024-06-12
+
+* Initial release.