Add issue templates

.github/ISSUE_TEMPLATE/binary_repository.md

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+---
+name: Issue with binary repository
+about: Report an issue about the binary repository mentioned in the README
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+Before reporting and issue, make sure to have **followed the instructions** on
+https://martchus.no-ip.biz/repo/arch/ownstuff.
+
+Note that packages are always built against the latest Arch Linux repository
+so other distributions such as Manjaro are *not* supported.
+
+Please prefer the `ftp.f3l.de` mirror as `martchus.no-ip.biz` is self-hosted.
+
+---
+
+Affected package (name and version): …
+Used mirror: …
+
+Brief description of the problem: …

.github/ISSUE_TEMPLATE/general_issue.md

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+---
+name: General issue
+about: Ask a question or report a problem about a specific (set of) packages
+title: ''
+labels:
+assignees: ''
+
+---
+
+**Before reporting an issue**, check whether there are pinned/recent comments on
+the AUR and whether your request is really in-line with
+https://wiki.archlinux.org/title/PKGBUILD.
+
+**For more general discussions and questions** about related topics such as
+mingw-w64 packaging in general, feel free to open or join a discussion on
+https://github.com/Martchus/PKGBUILDs/discussions.
+
+**Note that I cannot help with AUR helpers.** Please report problems with AUR
+helpers to their vendors.
+
+**Note that only Arch Linux is supported.** Packages may not build on other
+distributions such as Manjaro.
+
+---
+
+Relevant packages: …
+
+Your modifications to the build environment (e.g. changes in `makepkg.conf`):
+…
+
+Question/request or brief description of the problem:
+…