docs: add the Glama server score badge to the README

[whats2000]

What does this PR do?

Adds the Glama score badge to the README badge row, next to the existing Archestra quality badge.

The listing at glama.ai/mcp/servers/whats2000/isaacsim-mcp-server is already claimed under the personal account and publishes a live maintenance/quality score (license A, quality A, maintenance A), so the badge tracks that rather than being a static shield.

No glama.json accompanies this. Glama only requires that file to claim an org-hosted repo — a personal repo is claimed by GitHub auth alone — and its schema defines exactly one property, maintainers. It would be inert here. If the repo ever moves to an org, or a second maintainer needs Glama dashboard access, that is the moment to add it.

One line changed in README.md. No CHANGELOG.md entry: a README badge is not user-facing behavior in the sense that file tracks.

Tested Isaac Sim Version(s)

Not applicable — docs-only, no code path touched, so nothing was run in a live simulator.

• Isaac Sim 6.0.x — PhysX (isaac-sim.sh)
• Isaac Sim 6.0.x — Newton (isaac-sim.newton.sh)
• Isaac Sim 5.1.x
• Other (please specify): none — README badge row only

Before submitting

• This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
• Did you read the contributor guidelines?
• Was this discussed/approved via a GitHub issue? Please add a link to it if that's the case.
• Did you make sure to update the documentation with your changes? (the README is the change)
• Did you run the linter (ruff check . && ruff format .)? — no .py files touched
• Did you write any new necessary tests? — none apply
• Did you manually test the behavior in a running Isaac Sim instance? — docs-only

Who can review?

@whats2000

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