So instructions to make gtkcord 3 AppImage:
- Make a directory called AppDir
- Make a directories AppDir/usr/bin
- Compile gtkcord3 binary into that directory, for example go build -o AppDir/usr/bin/gtkcord3
- Make directory AppDir/usr/lib
- Make directories AppDir/usr/share/{applications,icons,metainfo}
- Make file AppDir/usr/share/metainfo/gtkcord3.appdata.xml and insert this: https://pastebin.com/08xGTPne
- Make file AppDir/usr/share/applications/gtkcord3.desktop and insert this: