Update PULL_REQUEST_TEMPLATE.md

Author: t2013anurag

PULL_REQUEST_TEMPLATE.md

@@ -1 +1,7 @@
-This pull request fixes #(issue number)
+Pull Request checklist - 
+
+- [ ] This pull request fixes #issue_reference (Create a issue if not already present.)
+- [ ] The directory structure is of the form (directory_name) (If directory doesn't exist, create a new.)
+- [ ] Don't duplicate stuff.
+
+Make sure all the above conditions are met before a PR is created.