add issue template

Author: Samueru-sama

.github/ISSUE_TEMPLATE/report-bug.md

@@ -0,0 +1,23 @@
+---
+name: "Bug report - AppImage (please attach debug log)"
+about: "Report crashes or other bugs. Run the AppImage with APPIMAGE_DEBUG=1 and attach the generated log file."
+---
+
+Please fill out the sections below.
+
+## Collect the AppImage debug log (required)
+1. Run the AppImage with debug enabled:
+   ```sh
+   APPIMAGE_DEBUG=1 ./MyApp.AppImage
+   ```
+   - The AppImage will create a debug log automatically and will print the path to that log file in the terminal output.
+   - Attach that file to this issue.
+
+## Make sure to ping the maintainer of the repository when making the bug report
+- Often times we miss emails because not all repositories are watched automatically after being made, so please ping the maintainer of the repository when making the issue. Simply add @name-of-maintainer.
+
+## Checklist
+- [ ] I ran the AppImage with `APPIMAGE_DEBUG=1` environment variable set.
+- [ ] I attached the debug log produced by the AppImage.
+- [ ] I pinged the maintainer of the repository.
+