Create PULL_REQUEST_TEMPLATE.md

Author: MoOx

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,13 @@
+<!--
+
+**Before submitting a pull request,** please make you followed our CONTRIBUTING guide
+
+https://github.com/reason-react-native/__template__/blob/master/CONTRIBUTING.md
+
+-->
+
+Closes #<number-of-the-issue>
+
+<!--
+Add any information that might be useful
+-->