Improve Quick Start tutorial for CPU-only Windows setup - draft

[smishra8]

This PR updates the docs/source/quick_start.rst file to improve reproducibility and accessibility for contributors working on CPU‑only Windows environments who are just starting and would like to see a very basic example which is runnable on CPU-builds.

Changes include:

• Clarifying installation steps for Windows users without GPU support.
• Adding explicit notes on compatibility and expected behavior.
• Providing beginner‑friendly code examples that compile and run on CPU‑only setups.

This is an incomplete draft. I am opening it early to gather feedback from maintainers and contributors before finalizing. I plan to add more descriptions and definitions for newcomers and more examples. I can also provide a Python script (similar to quick_start.py) adapted for CPU‑only builds.

[pytorch-bot[bot]]

:link: Helpful Links

:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/ao/3360

• :page_facing_up: Preview Python docs built from this PR

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

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