- Rename all files, directories, and internal project names to "MedicalLib".
- Replace the generic `add` function with a more domain-specific `calculateBMI` function as an initial example of the library's capabilities.
- Update the `AGENTS.md` file to describe the new purpose and scope of the MedicalLib library.
This commit introduces build scripts for both Windows (`build.bat`) and Linux/macOS (`build.sh`) to simplify the build process.
It also updates the `.gitignore` file to a more comprehensive version that includes common patterns for C++ projects and various IDEs.