docs: add Discussions link to README

[shenxianpeng]

The commit-check project has Discussions enabled, but this Action's README only references Issues. Added a link to Discussions so users know where to ask questions and share ideas.\n\nSee: https://github.com/commit-check/commit-check/discussions

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: f54b039c-a0da-4f4c-ae60-0fdc8355c337

📥 Commits

Reviewing files that changed from the base of the PR and between f4d3bed and a141929.

📒 Files selected for processing (1)

• README.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/add-discussions-link

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[github-actions]

Commit-Check ❌

Commit rejected by Commit-Check.                                  
                                                                  
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Commit rejected.                                                  
                                                                  
Type branch check failed ==> docs/add-discussions-link 
The branch should follow Conventional Branch. See https://conventionalbranch.org
Suggest: Use <type>/<description> with allowed types or add branch name to allow_branch_names in config, or use ignore_authors in config branch section to bypass