Update issue templates

.github/ISSUE_TEMPLATE/assignment-submission.md

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+---
+name: Assignment Submission
+about: Template to submit assignments
+title: Submission for assignment(s) X,Y,Z
+labels: assignments
+assignees: pkeilbach
+
+---
+
+I would like to submit the following assignments:
+
+- list the assignments you want to submit here
+- ...
+
+Provide screenshots of a successful test run that identifies your machine (e.g. a terminal screenshot of a successful test run that identifies your machine):
+
+_copy and paste screenshots here_
+
+Provide a short description of your major learnings or challenges (if any):
+
+- list your learnings and challenges here
+- ...