Metadata for zathura-pdf-mupdf in community

<component type="addon">
  <id>org.pwmt.zathura-pdf-mupdf</id>
  <name>Zathura-PDF-MuPDF</name>
  <summary>PDF plugin for zathura based on MuPDF</summary>
  <project_license>Zlib</project_license>
  <extends>org.pwmt.zathura</extends>
  <pkgname>zathura-pdf-mupdf</pkgname>
  <url type="homepage">https://pwmt.org/projects/zathura-pdf-mupdf/</url>
</component>