Adding PULL_REQUEST_TEMPLATE.md

Author: nyamsprod

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,25 @@
+## Introduction
+
+_(Please explain the library current status regarding your PR)_
+
+## Proposal 
+
+### Describe the new/upated/fixed feature
+
+_(Please explain your proposal)_
+
+### Backward Incompatible Changes
+
+_(Describe if they exists BC break)_
+
+### Targeted release version
+
+_(Indicate the release version targeted for your PR)_
+
+### PR Impact
+
+_(Describe the PR impact on the current public API)_
+
+## Open issues
+
+_(Describe possible open issues and/or future scope if any depending on this RFC acceptance)_