progress: add page (#3804)

pages/linux/progress.md

@@ -0,0 +1,16 @@
+# progress
+
+> Display/Monitor the progress of running coreutils.
+> More information: <https://github.com/Xfennec/progress>.
+
+- Show the progress of running coreutils:
+
+`progress`
+
+- Show the progress of running coreutils in quiet mode:
+
+`progress -q`
+
+- Launch and monitor a single long-running command:
+
+`{{command}} & progress -mp $!`