Add Pull Request Template (#95)

Author: Tankilevitch

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,15 @@
+# Description
+
+What -
+Why -
+How -
+
+## Type of change
+
+Please leave one option from the following and delete the rest:
+
+- [ ] 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)
+- [ ] Non-breaking change (fix of existing functionality that will not change current behavior)
+- [ ] Documentation (added/updated documentation)