Adding PR template

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,26 @@
+##### SUMMARY
+<!--- Describe the change, including rationale and design decisions -->
+
+<!---
+If you are fixing an existing issue, please include "fixes #nnn" in your
+commit message and your description; but you should still explain what
+the change does.
+-->
+
+##### ISSUE TYPE
+<!--- Pick one below and delete the rest: -->
+ - Breaking Change 
+ - New or Enhanced Feature
+ - Bug or Docs Fix
+
+##### ADDITIONAL INFORMATION
+<!---
+Include additional information to help people understand the change here.
+For bugs that don't have a linked bug report, a step-by-step reproduction
+of the problem is helpful.
+-->
+
+<!--- Paste verbatim command output below, e.g. before and after your change -->
+```
+
+```