imgp: add page (#2078)

pages/linux/imgp.md

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+# imgp
+
+> Command line image resizer and rotator for JPEG and PNG images.
+
+- Convert single images and/or whole directories containing valid image formats:
+
+`imgp -x {{1366x1000}} {{path/to/dir}} {{path/to/file}}`
+
+- Scale an image by 75% and overwrite the source image to a target resolution:
+
+`imgp -x {{75}} -w {{path/to/file}}`
+
+- Rotate an image clockwise by 90 degrees:
+
+`imgp -o {{90}} {{path/to/file}}`