Update marketplace add command in README

[kozo2]

Below is the reason why I am sending this PR.

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 You now have access to Sonnet 4.5 with 1M context (uses more rate limits than Sonnet on long requests) • Update in
 /model
  /model to try Opus 4.5

> /plugin marketplace add https://github.com/anthropics/life-sciences.git
  ⎿  Error: The name 'life-sciences' is reserved for official Anthropic marketplaces and can only be used with GitHub sources from the 'anthropics' organization.

> /model
  ⎿  Set model to opus (claude-opus-4-5-20251101)

> /plugin marketplace add https://github.com/anthropics/life-sciences.git
  ⎿  Error: The name 'life-sciences' is reserved for official Anthropic marketplaces and can only be used with GitHub sources from the 'anthropics' organization.

> /plugin marketplace add life-sciences
  ⎿  (no content)

> /plugin marketplace add anthropics/life-sciences
  ⎿  Successfully added marketplace: life-sciences

[Copilot]

Pull request overview

This PR updates the marketplace add command in the Quick Start section from the full GitHub URL format to the shorthand anthropics/life-sciences format, which is the correct syntax that works without errors.

Key Changes:

• Updated the marketplace add command syntax to use the shorthand format instead of the full GitHub URL

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