feat: add issue and PR templates

[shenxianpeng]

Fixes item #8 from plan

Adds org-wide default issue and PR templates for all cpp-linter repositories:

• bug_report.md — structured template for bug reports (environment info, reproduction steps)
• feature_request.md — template for feature suggestions (problem, solution, alternatives)
• PULL_REQUEST_TEMPLATE.md — PR checklist (summary, related issues, change type, checklist)

These serve as defaults for any repo in the cpp-linter org that doesn't define its own templates.

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📥 Commits

Reviewing files that changed from the base of the PR and between 94371c5 and 6f732c5.

📒 Files selected for processing (3)

• .github/ISSUE_TEMPLATE/bug_report.md
• .github/ISSUE_TEMPLATE/feature_request.md
• .github/PULL_REQUEST_TEMPLATE.md

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[shenxianpeng]

I just keep all issue templates more simplified

[shenxianpeng]

I am going to merge and review it, making changes as needed.