Updated PR template

Author: Przemog1

.github/pull_request_template.md

@@ -1,5 +1,8 @@
 ## Description
-<!-- Describe what problem this is solving, and how it's solved.-->
+<!-- Describe what problem this is solving, and how it's solved. -->
 
 ## Testing 
-<!-- Explain how this change is tested. -->
+<!-- Explain how this change was tested. -->
+
+## TODO list:
+<!-- A list of things that have to be finished before this PR can be merged -->