M #-: Add PR template

(cherry picked from commit 9ceb8a5)

Author: tinova

.github/pull_request_template.md

@@ -0,0 +1,15 @@
+### Description
+
+<!--- Please leave a helpful description of the PR here. --->
+
+### Branches to which this PR applies
+
+<!--- Please check you didn't forget a branch this needs to be cherry picked to.
+      Leave them unchecked, they will be checked by the merger --->
+
+- [ ] master
+- [ ] one-X.X
+
+<hr>
+
+- [ ] Check this if this PR should **not** be squashed