Add NestJS Guard, Decorator icons

[premdasvm]

Changes made:

1. Decorator icon - nest-decorator.svg
2. Middleware icon - nest-middleware.svg

to use:

  "symbols.files.associations": {
    "*.decorator.ts": "nest-decorator",
    "*.middleware.ts": "nest-middleware"
  }

[FabianMontoya]

It would be nice If you could add the other nestjs-files variants

[premdasvm]

@FabianMontoya Will do, i was planning to do it already.

[FabianMontoya]

@FabianMontoya Will do, i was planning to do it already.

Thank u for the work!

[miguelsolorio]

🫶 LGTM, thanks for the PR!