musescore: add page (#5368)

pages/common/mscore.md

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+# mscore
+
+> This command is an alias of `musescore`.
+
+- View documentation for the original command:
+
+`tldr musescore`

pages/common/musescore.md

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+# musescore
+
+> MuseScore 3 sheet music editor.
+> More information: <https://musescore.org/en/handbook/3/command-line-options>.
+
+- Use a specific audio driver:
+
+`musescore --audio-driver {{jack|alsa|portaudio|pulse}}`
+
+- Set the MP3 output bitrate in kbit/s:
+
+`musescore --bitrate {{bitrate}}`
+
+- Start MuseScore in debug mode:
+
+`musescore --debug`
+
+- Enable experimental features, such as layers:
+
+`musescore --experimental`
+
+- Export the given file to the specified output file. The file type depends on the given extension:
+
+`musescore --export-to {{output_file}} {{input_file}}`
+
+- Print a diff between the given scores:
+
+`musescore --diff {{path/to/file1}} {{path/to/file2}}`
+
+- Specify a MIDI import operations file:
+
+`musescore --midi-operations {{path/to/file}}`