Update quickstart.md

[observerw]

add description on using uv run instead of create environment

[github-actions]

👋 Hi! Thank you for contributing to the vLLM project.

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[DarkLight1337]

This should work ok but I don't use uv personally, so it would be best for @mgoin to check

[Isotr0py]

It worked on my side, LGTM!

/tmp# uv run --with vllm vllm --help
Installed 128 packages in 982ms
INFO 02-27 15:07:05 __init__.py:207] Automatically detected platform cuda.
usage: vllm [-h] [-v] {chat,complete,serve} ...

vLLM CLI

positional arguments:
  {chat,complete,serve}
    chat                Generate chat completions via the running API server
    complete            Generate text completions based on the given prompt via the running API server
    serve               Start the vLLM OpenAI Compatible API server

options:
  -h, --help            show this help message and exit
  -v, --version         show program's version number and exit