Recent updates to the README

[joecummings]

Context

What is the purpose of this PR? Is it to

• [ ] add a new feature
• [ ] fix a bug
• [x] update tests and/or documentation
• [ ] other (please add here)

We were missing some recent updates from our README. This adds a "updates" section that encapsulates recent changes + adds Qwen2.5 to our models + credits Optimox for adding Gemma2

Changelog

What are the changes made in this PR?

• Add recent updates section
• Add Qwen2.5 to the models
• Credit Optimox for Gemma2

Test plan

👁️

[pytorch-bot[bot]]

:link: Helpful Links

:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/torchtune/1979

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As of commit 5de217e590d8511e375e740306d370454436a361 with merge base e61def122cf4cd6e8a5ca21f954b9f1095e69861 (): :green_heart: Looks good so far! There are no failures yet. :green_heart:

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