flameshot: added page (#4324)

pages/linux/flameshot.md

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+# flameshot 
+
+> Screenshot utility with a gui interface.
+> Supports basic image editing, such as text, shapes, colors, and imgur.
+> More information: <https://flameshot.js.org>.
+
+- Launch flameshot in gui mode:
+
+`flameshot launcher`
+
+- Take a screenshot by clicking and dragging:
+
+`flameshot gui`
+
+- Take a full screen screenshot:
+
+`flameshot full`
+
+- Set the save path to write screenshots to:
+
+`flameshot full --path {{path/to/directory}}`
+
+- Delay the screenshot for N milliseconds and output to clipboard:
+
+`flameshot full --delay {{2000}} --clipboard`