Create bug report issue template

.gitlab/issue_templates/Bug Report.md

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+# Bug Report
+<!--
+Thank you for taking the time to report a bug! Before continuing, please make
+sure the bug hasn't been reported before by searching through the other issues.
+This will save both yourself and us some time. If you're sure there isn't
+another issue, continue through the template below. All the text between
+the opening and closing arrows (HTML comments) will not be shown in the end
+result.
+-->
+
+
+
+## Platform
+<!-- When possible, please provide what version you're running. -->
+
+* Operating System:
+* Browser:
+
+
+
+## What is happening and/or broken?
+<!-- Provide as many details as you can and if possible a little step-by-step
+guide so that we can reproduce the issue. Screenshots or a video that shows the
+problem also help immensely. -->
+
+
+
+## What is expected to happen?
+<!-- Explain what the expected result is if it's not clear from how it is
+broken. You can omit this if the expected result is just "It should work" or
+similar. -->
+
+
+
+<!-- ## How can it be fixed? -->
+<!-- As an optional step, if you have any ideas on potential solutions or fixes
+feel free to include those too. Don't forget to uncomment the header if you
+fill in this section. -->
+
+