adding license, code of conduct, templates... etc)

.github/PULL_REQUEST_TEMPLATE.md

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+## Description
+
+<!-- Please include a summary of the changes and the related issue (if applicable). Please also include relevant motivation and context. -->
+
+## Related Issue
+
+<!-- Please link to the issue here if applicable. -->
+
+## Type of Change
+
+Please check the option that best describes your change:
+
+- [ ] Bug fix (non-breaking change which fixes an issue)
+- [ ] New feature (non-breaking change which adds functionality)
+- [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
+- [ ] This change requires a documentation update
+- [ ] Performance improvement
+- [ ] Code refactoring
+- [ ] Documentation update
+
+## How Has This Been Tested?
+
+<!-- Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration. -->
+
+## Checklist:
+
+- [ ] My code follows the style guidelines of this project
+- [ ] I have performed a self-review of my own code
+- [ ] I have commented my code, particularly in hard-to-understand areas
+- [ ] I have made corresponding changes to the documentation
+- [ ] My changes generate no new warnings
+- [ ] I have added tests that prove my fix is effective or that my feature works
+- [ ] New and existing unit tests pass locally with my changes
+- [ ] Any dependent changes have been merged and published in downstream modules