okular: add page (#6070)

pages/common/okular.md

@@ -0,0 +1,28 @@
+# okular
+
+> A universal document viewer.
+> More information: <https://okular.kde.org/>.
+
+- Launch Okular:
+
+`okular`
+
+- Open specific documents in Okular:
+
+`okular {{path/to/file1 path/to/file2 ...}}`
+
+- Open a document at a specific page:
+
+`okular --page {{page_number}} {{path/to/file}}`
+
+- Open a document in presentation mode:
+
+`okular --presentation {{path/to/file}}`
+
+- Open a document and start the print dialog:
+
+`okular --print {{path/to/file}}`
+
+- Open a document and search for a specific string:
+
+`okular --find {{search_string}} {{path/to/file}}`