Metals VsCode Improvement

PerformanceMetals.md

Quick PSA on Metals with vscode

Since scala changes a lot of files in build and vscode watches those files. It actually has quite a delay. Adding this to settings will improve performance by an enormous degree. Especially on larger projects.

"files.exclude": {
        "**/.bloop": true,
        "**/.metals": true,
        "**/target": true
    },
    "files.watcherExclude": {
        "**/.bloop": true,
        "**/.metals": true,
        "**/target": true
    },

Thanks for this! I've opened a PR at scalameta/metals-vscode#372