Added application's desktop entries

applications/Ultimaker.desktop

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+[Desktop Entry]
+Name=Ultimaker Cura
+GenericName=3D Printing Software
+Comment=Cura converts 3D models into paths for a 3D printer. It prepares your print for maximum accuracy, minimum printing time and good reliability with many extra features that make your print come out great.
+Exec=/home/dbroqua/Softwares/Cura %F
+Icon=/home/dbroqua/icons/cura.png
+Terminal=false
+Type=Application
+MimeType=model/stl;application/vnd.ms-3mfdocument;application/prs.wavefront-obj;image/bmp;image/gif;image/jpeg;image/png;text/x-gcode;application/x-amf;application/x-ply;application/x-ctm;model/vnd.collada+xml;model/gltf-binary;model/gltf+json;model/vnd.collada+xml+zip;
+Categories=Graphics;
+Keywords=3D;Printing;Slicer;
+StartupWMClass=cura.real

applications/Zettlr.desktop

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+[Desktop Entry]
+Name=Zettlr
+Exec=/home/dbroqua/Softwares/Zettlr %U
+Terminal=false
+Type=Application
+Icon=/home/dbroqua/icons/zettlr.png
+StartupWMClass=zettlr
+Comment=A powerful Markdown editor for researchers.
+MimeType=text/markdown;text/markdown;
+Categories=Office;