Add some project related files

Author: theEvilReaper

CONTRIBUTING.md

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+## Contribution Guidelines
+
+Please ensure your pull request adheres to the following guidelines:
+
+- Search previous suggestions before making a new one, as yours may be a duplicate
+- Add documentation to your code
+- Provide test cases for your changes, if necessary

README.md

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+## Vulpes Spring Data
+
+This project provides a unified model structure for storing various data used in the Vulpes project.  
+It is utilized by both `vulpes-backend` and `vulpes-generator` to ensure consistency while avoiding code duplication.
+
+## Why SQL and not MongoDB?
+
+The initial plan was to use MongoDB for its flexible, schema-less storage.  
+However, during development, it became clear that this choice was not ideal. The data structure was not as flexible as
+expected, and the advantages of a schema-less database were not utilized.
+
+Additionally, since the data is inherently structured rather than unstructured, a SQL database proved to be the more
+suitable choice.
+
+## Contributing
+
+If you want to contribute to this project, please follow the guidelines in the [CONTRIBUTING.md](CONTRIBUTING.md) file.