Create PULL_REQUEST_TEMPLATE.md

.github/PULL_REQUEST_TEMPLATE.md

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+## Before creating a pull request, please check if you have met all required steps
+
+**Is this a fix or an improvement?**
+
+- [ ] Fix
+- [ ] Improvement
+
+**What does this change implement/fix?**
+
+...
+
+
+**Have discussed this change in an issue?**
+
+- [ ] Yes
+- [ ] No
+
+**Was some test failing because of this issue or change needed?**
+
+- [ ] Yes
+- [ ] No
+
+**Are you including tests to cover this change?**
+
+- [ ] Yes
+- [ ] No
+