Add pull request template

.github/pull_request_template.md

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+> :warning:
+> Hello, and thank you for your contributions!<br>
+> Please review the following checklist before creating a new pull request:
+>
+> - Review and contribute to existing pull requests and open issues to avoid redundant efforts.
+> - Read [the contribution guidelines](CONTRIBUTING.md).
+> - Assign reviewers.
+> - If applicable, include a reference to related issues.
+> - If this is a new feature, create an issue and coordinate with other contributors to make sure the feature can be made available in all platforms supported.
+>
+> :warning: Delete this block before creating the pull request.
+
+**Describe the changes proposed**<br>
+A clear and concise description of the changes included in this pull request.
+
+**Screenshots / Videos**<br>
+If useful, include any screeshots or screencasts to better explain the change.
+
+**Additional context**<br>
+Add any other context about the change here.