scrot: add page (#2733)

pages/linux/scrot.md

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+# scrot
+
+> Screen capture utility.
+
+- Capture a screenshot and save it to the current directory with the current date as the filename:
+
+`scrot`
+
+- Capture a screenshot and save it as "capture.png":
+
+`scrot {{capture.png}}`
+
+- Capture a screenshot interactively:
+
+`scrot --select`
+
+- Capture a screenshot from the currently focused window:
+
+`scrot --focused`