Add a changelog

CHANGELOG.md

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+# Changelog
+
+## Version 0.3
+
+### Improvements
+
+-   Replace SConstruct by CMake to build the project.
+-   Package the code as a library.
+-   Add unit tests (with sanitizers support) and code coverage.
+-   Use [`spdlog`](https://github.com/gabime/spdlog) instead of a custom logging system.
+-   Cleanup some APIs.
+-   Replace the library-defined `TokenTree` class by the range-constrained pseudo-random function implementation introduced in `crypto-tk` v0.3.
+-   Introduce new server runner classes (`DianaServerRunner` and `SophosServerRunner`) to improve the management of the different components of a runner, namely the service and the gRPC server.
+-   Added contribution guidelines.
+-   Improve the bash scripts of the project.
+-   Enable `-Werror` by default when compiling.
+
+
+### Fixes
+
+-   Fix numerous issues found using static analysis tools (`clang-tidy`, `cppcheck`)
+
+## Version 0.2
+
+First stable and usable version:
+
+-   Implementation of Sophos
+-   Implementation of Diana
+-   (Partial) implementation of Janus