📝 Add PULL_REQUEST_TEMPLATE.md (#30)

Co-authored-by: Matan Kushner <hello@matchai.me>

.github/PULL_REQUEST_TEMPLATE.md

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+<!--- Provide a general summary of your changes in the Title above -->
+
+#### Description
+<!--- Describe your changes in detail -->
+
+#### 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. -->
+Closes #
+
+#### Types of changes
+<!--- What types of changes does your code introduce? Put an `x` in all the boxes that apply: -->
+- [ ] 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 existing functionality to not work as expected)
+
+#### Screenshots (if appropriate):
+
+#### How Has This Been Tested?
+<!--- Please describe in detail how you tested your changes. -->
+<!--- Include details of your testing environment, tests ran to see how -->
+<!--- your change affects other areas of the code, etc. -->
+- [ ] I have tested using **MacOS**
+- [ ] I have tested using **Linux**
+- [ ] I have tested using **Windows**
+
+#### Checklist:
+<!--- Go over all the following points, and put an `x` in all the boxes that apply. -->
+<!--- If you're unsure about any of these, don't hesitate to ask. We're here to help! -->
+- [ ] I have updated the documentation accordingly.
+- [ ] I have updated the tests accordingly.