Add ARM CMSIS project template references to documentation

[rascani]

Summary

Link to Arm-Examples/cmsis-executorch and Arm-Examples/cmsis-zephyr-executorch repositories, which provide alternative project structures for deploying ExecuTorch on ARM embedded systems with CMSIS tooling.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/17454

• 📄 Preview Python docs built from this PR

Note: Links to docs will display an error until the docs builds have been completed.

❌ 1 Awaiting Approval, 2 New Failures

As of commit 22dfc69 with merge base c12dc35 ():

AWAITING APPROVAL - The following workflow needs approval before CI can run:

• periodic (gh)

NEW FAILURES - The following jobs have failed:

• pull / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 89aa03cc87b81da65eff5f010402a149a3c930f6d359eebbcdde07192bacb9e0 /exec failed with exit code 1
• pull / test-samsung-quantmodels-linux / linux-job (gh)
  RuntimeError: Command docker exec -t fb73d2e345817ab14a4d27a8547c716625eb8acddaef402022f8310aa3506f5f /exec failed with exit code 1

This comment was automatically generated by Dr. CI and updates every 15 minutes.

[github-actions]

This PR needs a release notes: label

If your change should be included in the release notes (i.e. would users of this library care about this change?), please use a label starting with release notes:. This helps us keep track and include your important work in the next release notes.

To add a label, you can comment to pytorchbot, for example
@pytorchbot label "release notes: none"

For more information, see
https://github.com/pytorch/pytorch/wiki/PyTorch-AutoLabel-Bot#why-categorize-for-release-notes-and-how-does-it-work.