docs: add MIT LICENSE file

[diiabblo]

Summary

This PR adds a standard MIT LICENSE file to the project to clarify the open-source licensing terms.

Changes

• Added MIT LICENSE file at project root
• Copyright assigned to diiabblo (2025)
• Standard MIT license terms for open source usage

Why

Adding a license is essential for any open-source project as it:

• Clarifies usage rights for contributors and users
• Protects both the author and users legally
• Encourages adoption by making terms clear

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