Create CHANGELOG.md - Version 0.1.0

Author: aafulei

CHANGELOG.md

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+# Changelog
+
+## 0.1.0
+
+**Initial release of the `today` program.**
+
+### Added
+
+- Source code:
+    - `today.cpp` - Initial release of the `today` program
+- Build system:
+    - `Makefile` - Simple Make-based build system
+- Code formatting configuration:
+    - `.clang-format` for Clang Format
+- Editor tooling support:
+    - `compile_flags.txt` for `clangd`