chore: add pull request template

.github/PULL_REQUEST_TEMPLATE.md

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+# Motivation
+
+[Include the reason behind these changes and any relevant context.]
+
+# Description
+
+[Provide a detailled explanation of the modifications you have made. Link any related issues.]
+
+# Testing
+
+[When applicable, detail the testing you have performed to ensure that these changes function as intended. Include information about any added tests.]
+
+# Impact
+
+[Discuss the impact of your modifications on ArmoniK. This might include effects on performance, configuration, documentation, new dependencies, or changes in behaviour.]
+
+# Additional Information
+
+[Any additional information that reviewers should be aware of.]
+
+# Checklist
+
+- [ ] My code adheres to the coding and style guidelines of the project.
+- [ ] I have performed a self-review of my code.
+- [ ] I have commented my code, particularly in hard-to-understand areas.
+- [ ] I have made corresponding changes to the documentation.
+- [ ] I have thoroughly tested my modifications and added tests when necessary.
+- [ ] Tests pass locally and in the CI.
+- [ ] I have assessed the performance impact of my modifications.