Add pull request template

.github/PULL_REQUEST_TEMPLATE.md

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+# Description
+
+Summarise your change here and the motivation or context for it.
+
+Fixes # .
+
+## Type of change
+
+- [ ] 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)
+- [ ] Documentation update
+
+# Test strategy
+
+Please describe the tests you have performed to verify your changes. Provide instructions so that we can reproduce and details of your test configuration:
+
+**Test Configuration**:
+* Fish version:
+* OS: