Add lavalink soundcloud search support.
Created by: nathan130200
Summary
Fixes #380 (closed)
Details
Implemented support to search specific audio source (youtube and soundcloud). Defaults to: Youtube.
Notes
- Add .editorconfig file to force VS/VSCode/VSMac/Any .NET IDE use specific project pattern like Spaces intead of tabs, and full qualification on method, property, field and event.