Supports the most basic UTAU usage

Support the most basic UTAU use, support pitch parameters. This is just a basic test.

Build. MSVC 2022 Windows x64

Source: https://github.com/YuzukiTsuru/lessampler/blob/master/test/AudioProcessTest.cpp

What's Changed

• Create LICENSE by @YuzukiTsuru in #2
• Change to gpl3.0 by @YuzukiTsuru in #3

New Contributors

• @YuzukiTsuru made their first contribution in #2

Full Changelog: https://github.com/YuzukiTsuru/lessampler/commits/alpha.0.0.0