docs: Added MIT compliant LICENSE

[michealroberts]

Description

Added MIT compliant LICENSE

Type of Change

• Examples / docs / tutorials / dependencies update
• Bug fix (non-breaking change which fixes an issue)
• Improvement (non-breaking change which improves an existing feature)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Security fix

Checklist

• I've read the CODE_OF_CONDUCT.md document.
• I've read the CONTRIBUTING.md guide.
• I've updated the code style using black.
• I've written tests for all new methods and classes that I created.
• I've written the docstring in numpy style for all the methods and classes that I used.

[michealroberts]

As raised here, #27, we should have an accompanying LICENSE file.

[lgrcia]

Thanks a lot for the quick answer @michealroberts!