Chore: Created a pull request template

.github/pull_request_template.md

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+<!-- !! Thank your for opening a PR !! -->
+
+<!--- Provide a short summary of your changes in the Title above -->
+
+## Description
+<!--- Describe your changes in detail -->
+
+## Related Issue
+<!--- If applicable, please type an `x` in one of the boxes below and provide the issue number after the # sign: -->
+- [ ] Closes #
+- [ ] Related to #
+
+## Checklist
+<!--- Make sure you have completed the following steps before submitting your PR -->
+<!--- Feel free to type an `x` in all the boxes below to let us know you have completed the steps: -->
+- [ ] Checked that the pre-commit checks pass (see [your-first-code-contribution](https://github.com/Mews/flask-utils/blob/main/CONTRIBUTING.md#your-first-code-contribution) and also [pre-commit](https://docs.pymc.io/en/latest/contributing/python_style.html))
+- [ ] Checked that all the tests pass (see [your-first-code-contribution](https://github.com/Mews/flask-utils/blob/main/CONTRIBUTING.md#your-first-code-contribution))
+- [ ] Checked that your commit messages follow [the specified guidelines](https://github.com/Mews/flask-utils/blob/main/CONTRIBUTING.md#commit-messages)
+- [ ] Added necessary documentation (docstrings and/or example notebooks, if applicable)
+
+## Type of change
+<!--- Select one of the categories below by typing an `x` in the box -->
+- [ ] New feature / enhancement
+- [ ] Bug fix
+- [ ] Documentation
+- [ ] Maintenance
+- [ ] Other (please specify):