Create pull request template for contributions

.github/pull_request_template.md

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+<!--- Provide a general summary of your changes in the Title above -->
+<!--- Please request review from the appropriate code owners or maintainers -->
+
+## Description
+<!--- Describe your changes in detail and include references -->
+<!--- Please indicate any issues resolved -->
+
+## Motivation and Context
+<!--- Why is this change required? What problem does it solve? -->
+<!--- If it fixes an open issue, please link to the issue here. -->
+
+## Types of changes
+<!--- The types are adapted from https://kapeli.com/cheat_sheets/Conventional_Commits.docset/Contents/Resources/Documents/index -->
+<!--- What types of changes does your code introduce? Put an `x` in all the boxes that apply: -->
+- [ ] CI <!--- Changes to the continuous integration configuration -->
+- [ ] Docs <!--- Documentation only changes -->
+- [ ] Feature <!--- Non-breaking change that adds a new feature -->
+- [ ] Fix <!--- Non-breaking change which addresses an issue -->
+- [ ] Performance <!--- A code change that improves performance -->
+- [ ] Refactor <!--- Non-breaking change that neither fixes a bug nor adds a feature -->
+- [ ] Style <!--- A change that corrects the style of the code presentation -->
+- [ ] Test <!--- Adding missing tests or correcting existing tests -->
+- [ ] Other (**use sparingly**): <!--- Use this sparingly. Please describe the type of change. -->
+
+## Checklists:
+<!--- Go over all the following points, and put an `x` in all the boxes that apply. -->
+
+**Code and Comments**
+If this PR includes modifications to the code base, please select all that apply.
+- [ ] My code follows the code style of this project.
+- [ ] I have updated all package dependencies (if any).
+- [ ] I have included all relevant files to realize the functionality of the PR. 
+- [ ] I have exported relevant functionality (if any).
+
+**API Documentation**
+- [ ] For every exported function (if any), I have included a detailed docstring.
+- [ ] I have checked the spelling and grammar of all docstring updates through an external tool.
+- [ ] I have checked that the docstring's function signature is correctly formatted and has all arguments.
+- [ ] I have checked that the docstring's list of arguments, fields, or return values match the function.
+- [ ] I have compiled the docs locally and read through all docstring updates to check for errors. 
+
+**Manual Documentation**
+- [ ] I have checked the spelling and grammar of all manual updates through an external tool.
+- [ ] Any code included in the docstring is tested using doc tests to ensure consistency.
+- [ ] I have compiled the docs locally and read through all manual updates to check for errors. 
+
+**Testing**
+- [ ] I have added unit tests to cover my changes. (For Macros, be sure to check
+  [@code_lowered](https://docs.julialang.org/en/v1/stdlib/InteractiveUtils/#InteractiveUtils.@code_lowered) and
+  [@code_typed](https://docs.julialang.org/en/v1/stdlib/InteractiveUtils/#InteractiveUtils.@code_typed))
+- [ ] All new and existing tests passed.
+- [ ] I have achieved sufficient code coverage.
+