Support programmatically several images sources #727
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In order to create a pdf with several pages from images (or other formats that allow pages), I need to use gm final command like this: "gm convert image01.jpg image02.jpg -quality 100 test.pdf".
So I add a way to add several "sources" to the main "gm()" function the "source" parameter now can be an array of paths and this allows "programmatically" set several sources, ex. read folder tree and set the paths to "gm()".
This is possible to achieve with chaining ".in()" custom argument or with spread operator ex. ".in(...[])" but it is less practical.
I added two user cases more in README.md in "Basic Usage" section.