shotcut: add page (#14007)

Co-authored-by: Wiktor Perskawiec <git@spageektti.cc>

pages/common/shotcut.md

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+# shotcut
+
+> A program for video editing.
+> More information: <https://shotcut.org/notes/command-line-options/>.
+
+- Start Shotcut:
+
+`shotcut`
+
+- Open audio/video files:
+
+`shotcut {{path/to/file1 path/to/file2 ...}}`
+
+- Start with a specific audio driver:
+
+`shotcut --SDL_AUDIODRIVER "{{pulseaudio}}"`
+
+- Start in fullscreen:
+
+`shotcut --fullscreen`
+
+- Start with GPU processing:
+
+`shotcut --gpu`