ci: add pr review template

.github/pull_request_template.md

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+## What
+Write a summary of the changes made in the PR.
+
+## Why
+Exlpain the reasons for the changes.
+
+## Type of change
+Select multiple if applicable.
+
+- [ ] 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 a breaking change)
+- [ ] Tests (adds or updates tests)
+- [ ] Documentation (adds or updates documentation)
+- [ ] Refactor (style improvements, performance improvements, code refactoring)
+- [ ] Revert (reverts a commit)
+- [ ] CI/Build (adds or updates a script, change in external dependencies)
+
+## Dependency Change
+If a new dependency is being added, please ensure that it adheres to the following guideline https://github.com/apimatic/apimatic-codegen/wiki/Policy-of-adding-new-dependencies-in-the-core-libraries
+
+## Breaking change
+If the PR is introducing a breaking change, please ensure that it adheres to the following guideline https://github.com/apimatic/apimatic-codegen/wiki/Guidelines-for-maintaining-core-libraries 
+
+## Testing
+List the steps that were taken to test the changes
+
+## Checklist
+- [ ] My code follows the coding conventions
+- [ ] I have performed a self-review of my own code
+- [ ] I have commented my code, particularly in hard-to-understand areas
+- [ ] I have added new unit tests