Hints for tlauncher in games

Hints

• asv-unknown-tag
  org.tlauncher.tlauncher.metainfo.xml:11 - supports
  Found invalid tag. Non-standard tags should be prefixed with `x-`. AppStream also provides the <custom/> tag to add arbitrary custom data to metainfo files. This tag is read by AppStream libraries and may be useful instead of defining new custom toplevel or `x-`-prefixed tags if you just want to add custom data to a metainfo file.