add templates and guidelines

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: bug
+assignees: ''
+---
+
+<!-- DO NOT SUBMIT SUPPORT REQUESTS OR "HOW TO" QUESTIONS HERE!
+
+If you have a question, start a GitHub Discussion:
+https://github.com/pedrolcl/sonivox/discussions
+
+Below is a form that shall help getting relevant information for bugs together.
+Feel free to edit or remove inapplicable/unneeded parts.
+-->
+
+### Sonivox version
+You may run `example/sonivoxrender` on your build directory to output the version numbers:
+
+```bash
+$ example/sonivoxrender --version
+version: 3.6.15.0
+```
+
+### Describe the bug
+A clear and concise description of what the bug is, including error messages and debugger output.
+If the bug is a program crash, please provide a back trace running the program on the debugger.
+
+### Steps to reproduce the wrong behavior:
+1.
+2.
+3...
+
+### Expected behavior
+A clear and concise description of what you expected to happen.
+
+#### Screenshots
+If applicable, add screenshots to help explain your problem.
+
+#### Additional context
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: enhancement
+assignees: ''
+---
+
+<!-- DO NOT SUBMIT SUPPORT REQUESTS OR "HOW TO" QUESTIONS HERE!
+
+If you have a question, start a GitHub Discussion:
+https://github.com/pedrolcl/sonivox/discussions
+
+Below is a form that shall help getting relevant information for features together.
+Feel free to edit or remove inapplicable/unneeded parts.
+-->
+
+### Describe the feature
+
+A clear and concise description of what the feature is and why it would be useful.
+
+#### Additional context
+
+Add any other context or screenshots about the feature request here.

.github/PULL_REQUEST_TEMPLATE.md

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+## Description
+
+Please describe the changes you've made.
+
+## Related Issues
+
+[Link to any related issues](https://docs.github.com/en/issues/tracking-your-work-with-issues/using-issues/linking-a-pull-request-to-an-issue) here, for instance using the verbs `Fix` or `Close`
+
+## Checklist
+
+- [ ] I have followed the contribution guidelines.
+- [ ] My code follows the coding standards.
+- [ ] I have tested my changes.
+

CONTRIBUTING.md

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+# Contributing to Sonivox
+
+Thank you for considering contributing to Sonivox!
+
+## Workflow
+
+We do not allow merge requests into the `master` branch directly. Please follow these steps:
+
+1. Fork (and clone) the repository.
+2. Create a new branch from `devel` for your changes.
+3. Open an issue describing the contributions you plan to make.
+4. Make your changes and commit them with clear commit messages.
+5. Open a pull request to merge your changes into the `devel` branch.
+
+## Coding Standards
+
+- Follow the existing coding style.
+- Write clear and concise commit messages.
+- Ensure your code passes all tests.
+
+## Pull Requests
+
+When opening a pull request, please:
+- Describe the changes you've made.
+- Link to the issue describing your contributions.
+- Ensure your code follows the contribution guidelines.