docs: Added CONTRIBUTING.md (#19)

Closes #17

CONTRIBUTING.md

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+# Contributing
+Thank you for taking an interest in this project! Following these guidelines helps me address your issues and changes.
+
+This project is open to contributions from everyone, not just code. Reporting bugs, suggesting features, improving documentation, and writing code are all valuable contributions; I appreciate them all equally.
+
+## Getting Started
+Please ask before putting significant time into a new feature or bug fix. This project is a hobby, and I may already be working on something similar. If you have a new idea, I would love to hear about it!
+
+Create a new issue if one doesn't already exist and I'll respond as soon as I can. If you're interested in working on an issue, please leave a comment so I can assign it to you.
+
+## Pull Requests
+Pull requests are welcome! This project uses [Conventional Commits](https://www.conventionalcommits.org/) for PR titles. Please follow this format when making changes. Some examples include:
+
+- `feat: added new feature`
+- `fix(cli): corrected typo in help message`
+- `docs: updated README.md`
+
+Descriptions are useful for me to understand the changes.
+
+Following this format ensures your changes can be automatically versioned and released in a timely manner. If you're unsure, I can help you with this process.