Add security policy, pull request template, and new issue templates (feature request, question)

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature Request
+description: Suggest an idea for this project
+labels: enhancement
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here. 

.github/ISSUE_TEMPLATE/question.md

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+---
+name: Question
+about: Ask a question or request support
+labels: question
+---
+
+**Your question**
+Please describe your question or what you need help with.
+
+**Context**
+Add any other context or details that might help us answer your question. 

.github/PULL_REQUEST_TEMPLATE.md

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+# Pull Request Template
+
+Thank you for your contribution!
+
+Please fill out the following checklist and provide all relevant information to help us review your pull request.
+
+## Description
+
+Please include a summary of the change and which issue is fixed (if any). Also describe your motivation and context.
+
+Fixes #(issue)
+
+## Checklist
+- [ ] My code follows the project style and guidelines
+- [ ] I have performed a self-review of my code
+- [ ] I have tested the changes and they work as expected
+- [ ] I have added tests that prove my fix is effective or that my feature works (if applicable)
+- [ ] I have added necessary documentation (if appropriate)
+
+## Additional Information
+
+Please add any other information or screenshots that may help the reviewers. 

.github/SECURITY.md

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+# Security Policy
+
+## Reporting a Vulnerability
+
+If you discover a security vulnerability, please report it by emailing the project maintainers at [your-email@example.com].
+
+- Do **not** create a public issue for security vulnerabilities.
+- Provide as much information as possible to help us understand and address the issue quickly.
+- We will acknowledge your report within 3 business days and strive to resolve all security issues promptly.
+
+Thank you for helping keep this project and its users safe!