Update issue templates (#8)

.github/ISSUE_TEMPLATE/issue-template.md

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+---
+name: Issue Template
+about: The general template for issues
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+## Motivation
+
+<!--
+Explain briefly what this change aims to achieve and why it is important to do so.
+Please keep this description updated with any discussion that takes place so
+that reviewers can understand your intent. Keeping the description updated is
+especially important if they didn't participate in the discussion.
+-->
+
+## Changes
+
+<!--
+List the changes made to the code base. Per default, all commits are listed here.
+Please keep this description updated as you add new changes to the MR.
+-->
+
+## Tests done
+
+<!--
+List the tests that were done to verify the changes.
+-->
+
+## TODO
+
+- [X] I've assigned myself to this MR
+
+<!--
+This section is kept for work needed to approve the MR. Per default, you may leave it empty.
+-->