Add GitHub issue templates (bug report & feature request)

[shenxianpeng]

Context

This repo has no .github/ISSUE_TEMPLATE/, so new issues start blank and often miss key details (pre-commit rev, hook id, args, clang tool version, OS). Our sibling repo cpp-linter-action already uses YAML issue forms — we can mirror that style, adapted to a pre-commit context.

Task

Add three files under .github/ISSUE_TEMPLATE/:

• bug-report.yml — fields for: .pre-commit-config.yaml snippet, hook id (clang-format/clang-tidy), rev and --version used, OS, and expected vs. actual behavior.
• feature-request.yml — problem/motivation + proposed solution.
• config.yml — blank_issues_enabled: false and contact links to the docs and Discussions.

The cpp-linter-action templates are a good starting point — copy their structure and adjust the fields for pre-commit usage (drop GitHub-Action-specific inputs).

Acceptance criteria

• "New issue" shows the two forms plus the contact links.
• Fields are relevant to pre-commit usage (not GitHub-Action fields).

Getting started

GitHub's issue-forms syntax. No code involved.