Add an integration with Dolphin

dolphin/README.md

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+Dolphin integration
+===================
+
+Thanks to [Miguel Marco](https://riemann.unizar.es/~mmarco/), here is an neat
+integration for [Dolphin](https://kde.org/applications/system/org.kde.dolphin),
+the KDE file manager:
+
+1. Add the `mat.desktop` file either in
+	- `/usr/share/kservices5/ServiceMenus/` to install it globally
+	- `~/.local/share/kservices5/ServiceMenus/` for a specific user
+2. Run `kbuildsycoca5` to update the corresponding database
+3. Enjoy your new contextual menu to remove metadata from your files!
+
+

dolphin/mat2.desktop

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+[Desktop Entry]
+X-KDE-ServiceTypes=KonqPopupMenu/Plugin
+MimeType=application/pdf;application/vnd.oasis.opendocument.chart ;application/vnd.oasis.opendocument.formula ;application/vnd.oasis.opendocument.graphics ;application/vnd.oasis.opendocument.image ;application/vnd.oasis.opendocument.presentation ;application/vnd.oasis.opendocument.spreadsheet ;application/vnd.oasis.opendocument.text ;application/vnd.openxmlformats-officedocument.presentationml.presentation ;application/vnd.openxmlformats-officedocument.spreadsheetml.sheet ;application/vnd.openxmlformats-officedocument.wordprocessingml.document ;application/x-bittorrent ;application/zip ;audio/flac ;audio/mpeg ;audio/ogg ;audio/x-flac ;image/jpeg ;image/png ;image/tiff ;image/x-ms-bmp ;text/plain ;video/mp4 ;video/x-msvideo;
+Actions=cleanMetadata;
+Type=Service
+
+[Desktop Action cleanMetadata]
+Name=Clean metadata
+Name[es]=Limpiar metadatos
+Icon=/usr/share/icons/hicolor/scalable/apps/mat2.svg
+Exec=kdialog --yesno  "$( mat2 -s %U )" --title "Clean Metadata?" && mat2 %U