Add GitHub templates for issues and pull requests

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Report a problem so we can fix it
+labels: [bug]
+---
+
+# Bug report summary
+A clear, concise description of the problem.
+
+## Steps to reproduce
+1.
+2.
+3.
+
+## Expected behavior
+What you expected to happen.
+
+## Actual behavior
+What actually happened.
+
+## Screenshots or logs
+Add screenshots or logs if they help explain the issue.
+
+## Additional context
+Anything else that might help us investigate.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea or enhancement
+labels: [enhancement]
+---
+
+# Feature request summary
+A clear, concise description of the feature.
+
+## Problem to solve
+What problem would this feature solve? Who benefits?
+
+## Proposed solution
+How you think this could work. Include examples if helpful.
+
+## Alternatives considered
+Other approaches you have considered.
+
+## Additional context
+Anything else that helps evaluate the request.

.github/pull_request_template.md

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+## Description
+What does this change do?
+
+## Changes
+Describe the changes of this pull request.
+
+## Screenshots (if UI changes)
+Add screenshots or recordings if helpful.
+
+## Closes
+- #[replace with issue no.]