Update issue templates (#215)

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,17 @@
+---
+name: Bug report
+about: Create a report to help improve Vineflower
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+## Quiltflower version
+Replace this text with the version of Vineflower that you are using.
+
+## Describe the bug
+Replace this text with a clear and concise description of what the bug is.
+
+## Additional information
+Replace this text with any stacktraces, screenshots, example code, or class files (Only if you have the rights to distribute them!) here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea to improve Vineflower
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+## Is your feature request related to a problem? Please describe.
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+## Describe the solution you'd like
+A clear and concise description of what you want to happen.
+
+## Additional context
+Add any other context or screenshots about the feature request here.