add NestJS Vienna meetup

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Resource type (required)

• GitHub Repository:
  • (Required) I confirm that the GitHub repository has more than 10 stars.
  • (Required) The repository is not archived.
• Video.
• Tutorial.
• Meetups.
• Improve documentation (grammatical corrections, improve doc style, ...).

If your contribution is NOT a GitHub repository, then you can skip the next titles, except "Rules".

Description (required)

Brief description of the resource you are adding.

Link (required)

Paste link here.

Rules (required)

• NestJS / Nest: It's not nest, nestjs, nest.js, and other variants.
• Node.js: It's not nodejs, node, and other variants.