This commit adds the initial project files to the repository. The .gitignore file is added to exclude unnecessary files from version control. The CHANGELOG.md file is added to document notable changes to the project. The LICENSE.md file is added to specify the license under which the project is released. The README.md file is added to provide an overview of the project and its purpose.

🎉 feat: add project configuration files and dependencies
This commit adds the following files to the project:
- pyproject.toml: contains project metadata, classifiers, dependencies, and URLs
- requirements.txt: contains additional dependencies for the project
- setup.cfg: contains metadata for the project
- src/longsight/__init__.py: an empty file

These files are necessary for the project to be built and distributed. The dependencies listed in pyproject.toml and requirements.txt are required for the project to function properly.

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