Create gifsicle.md

Examples from http://www.lcdf.org/gifsicle/

common/gifsicle.md

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+# gifsicle
+
+> Create gifs
+
+- Making a GIF animation with gifsicle is easy:
+
+`gifsicle --delay=10 --loop *.gif > anim.gif`
+
+- Extracting frames from animations is easy too:
+
+`gifsicle anim.gif '#0' > firstframe.gif`
+
+- You can also edit animations by replacing, deleting, or inserting frames:
+
+`gifsicle -b anim.gif --replace '#0' new.gif`