docs: add top-level MIT license file

[gauravsaxena1997]

Summary

• add a top-level LICENSE file with the MIT text already declared in the README
• align the repository metadata with downstream tooling expectations

Why

• addresses Add a top-level LICENSE file matching the README's MIT declaration #249
• gives downstream consumers a real license file instead of relying on README prose alone

Testing

• verified the repository now contains a root LICENSE file on this branch

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