Create pull_request_template.md (#66)

Author: obalunenko

.github/pull_request_template.md

@@ -0,0 +1,17 @@
+## Description
+
+_Implemented solution for puzzle https://adventofcode.com/{year}/day/{day}_
+
+## Github Issue
+
+_If any, add a JIRA ticket number._
+
+## Possible failures/side-effects
+
+_Describe any possible failure scenarios and which of them have been tested._
+
+_Doing so helps identify any missed cases and/or side effects._
+
+## Other notes
+
+_Anything else to add?_