gitlab: Add issue templates

.gitlab/issue_templates/Change.md

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+<!--
+Thanks for suggesting a change
+
+Please focus on the benefit that the change should bring. Not on how it should be implemented or designed. Preferably, you describe what you actually wanted to do and why, when you noticed that Loupe needs a change.
+-->

.gitlab/issue_templates/Default.md

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+<!--
+Thanks for getting in touch with the Loupe project
+
+Please select one of the issue templates above.
+
+For questions, please use the "Issue" template.
+-->

.gitlab/issue_templates/Feature.md

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+<!--
+Thanks for suggesting a feature
+
+Please focus on the benefit that the feature should bring. Not on how it should be implemented or designed. Preferably, you describe what you actually wanted to do and why, when you noticed that Loupe is lacking the feature.
+-->

.gitlab/issue_templates/Issue.md

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+<!--
+Thanks for reporting an issue
+
+In addition to describing the issue, we kindly ask you to also paste the information from the following dialog:
+
+“About Loupe” → “Troubleshooting” → “Debugging Information”
+-->