improve installation & usage instructions for ops‑mathImprove installation and usage instructions for ops-math

[Luoyukeji]

Enhanced the installation and usage instructions for ops-math, focusing on clarity and troubleshooting for new users in Ascend-NPU environments. Added detailed steps for setup, a troubleshooting section, and an example usage snippet.

What this PR does / why we need it?

Does this PR introduce any user-facing change?

How was this patch tested?

• vLLM version: v0.11.0
• vLLM main: vllm-project/vllm@83f478b

[github-actions]

👋 Hi! Thank you for contributing to the vLLM Ascend project. The following points will speed up your PR merge:‌‌

• A PR should do only one thing, smaller PRs enable faster reviews.
• Every PR should include unit tests and end-to-end tests ‌to ensure it works and is not broken by other future PRs.
• Write the commit message by fulfilling the PR description to help reviewer and future developers understand.

If CI fails, you can run linting and testing checks locally according Contributing and Testing.

[gemini-code-assist]

Code Review

This pull request appears to be intended to improve documentation. However, the main change submitted is the addition of a file that contains a commit message. This is a procedural error, as commit messages should be part of the Git history, not files within the repository. My review focuses on this critical issue, recommending the removal of the file.

[gemini-code-assist]

This file appears to contain a detailed commit message. Such content should be part of the Git commit metadata itself, not a file within the repository. Adding files like this clutters the project's file tree. Please remove this file from the pull request and use its content for the commit message.