Added PR template to help us get more info from contributors

Former-commit-id: f7fa6f4a3d

.github/pull_request_template.md

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+# Description
+
+Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context, such as the description of the bug you're trying to fix. 
+
+Fixes # (issue)
+
+## Type of change
+
+Please delete options that are not relevant.
+
+- [ ] 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)
+- [ ] This change requires a documentation update
+
+## Shells this fix should effect: 
+- [ ] bash
+- [ ] zsh 
+- [ ] fish 
+
+## Shells this fix has been tested in: 
+- [ ] bash
+- [ ] zsh 
+- [ ] fish 
+
+**Test Configuration**:
+* OS:
+
+# Checklist:
+
+- [ ] My code follows the style guidelines of this project
+- [ ] I have performed a self-review of my own code
+- [ ] I have commented my code, particularly in hard-to-understand areas
+- [ ] I have made corresponding changes to the documentation
+
+@cjappl @wxfr