libreoffice: add page (#4489)

pages/linux/libreoffice.md

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+# libreoffice
+
+> CLI for the powerful and free office suite LibreOffice.
+> More information: <https://www.libreoffice.org/>.
+
+- Open a space-separated list of files in read-only mode:
+
+`libreoffice --view {{path/to/file1}} {{path/to/file2}}`
+
+- Display the content of specific files:
+
+`libreoffice --cat {{path/to/file1}} {{path/to/file2}}`
+
+- Print files to a specific printer:
+
+`libreoffice --pt {{printer_name}} {{path/to/file1}} {{path/to/file2}}`
+
+- Convert all .doc files in current directory to pdf:
+
+`libreoffice --convert-to {{pdf}} {{*.doc}}`