clifm: add page (#7645)

pages/common/clifm.md

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+# clifm
+
+> The command line file manager.
+> More information: <https://github.com/leo-arch/clifm>.
+
+- Start CliFM:
+
+`clifm`
+
+- Open the file or directory whose ELN (entry list number) is 12:
+
+`12`
+
+- Create a new file and a new directory:
+
+`n file dir/`
+
+- Search for PDF files in the current directory:
+
+`/*.pdf`
+
+- Select all PNG files in the current directory:
+
+`s *.png`
+
+- Remove the previously selected files (use `t` to send the files to the recycle bin instead):
+
+`r sel`
+
+- Display detailed help:
+
+`?`
+
+- Exit CliFM:
+
+`q`