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Add reference to the llama2 example for llama3 (#3142)

Summary:
In conjunction with iseeyuan's changes, add an `examples/models/llama3/README.md` just in case people are looking for a Llama 3 folder in examples.

Pull Request resolved: https://github.com/pytorch/executorch/pull/3142

Reviewed By: mikekgfb

Differential Revision: D56337484

Pulled By: orionr

fbshipit-source-id: 0e122b2bbaa3bdcd95c83ed45a28b96cc0b24ba7
O
Orion Reblitz-Richardson committed
3db0362989192c5dc135187c5347e15c76d87fc8
Parent: 06beace
Committed by Facebook GitHub Bot <facebook-github-bot@users.noreply.github.com> on 4/19/2024, 3:37:24 AM