mogrify: add page (#1447)

pages/common/mogrify.md

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+# mogrify
+
+> Tool that allows making operations on multiple images ie. resizing, cropping, flipping, adding effects. Replaces the original file.
+
+- Resize all jpg images in the folder to 50% of their initial size:
+
+`mogrify -resize {{50%}} {{*.jpg}}`
+
+- Resize all images starting with DSC to 800x600:
+
+`mogrify -resize {{800x600}} {{DSC*}}`
+
+- Convert all png images in the folder to jpg:
+
+`mogrify -format {{jpg}} {{*.png}}`
+
+- Halve the saturation for all image files in the folder:
+
+`mogrify -modulate {{100,50}} {{*}}`
+
+- Double the brightness for all image files in the folder:
+
+`mogrify -modulate {{200}} {{*}}`