Add pull request template, closes #62

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,32 @@
+## Types of changes
+
+What types of changes does your code introduce? Check/place 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 change)
+- [ ] I have read the **CONTRIBUTING** document.
+- [ ] My code follows the code style of this project.
+- [ ] My change requires a change to the documentation.
+- [ ] I have updated the documentation accordingly.
+- [ ] I have added tests to cover my changes.
+- [ ] All new and existing tests passed.
+
+## 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.)
+
+## How Has This Been Tested?
+
+(Please describe in detail how you tested your changes.)
+(Include details of your testing environment, and the tests you ran to)
+(see how your change affects other areas of the code, etc.)
+
+## Screenshots:
+
+(if appropriate)