added tut_intro model file, also made changes to the intro tutorial document#71
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Gmotion94 wants to merge 2 commits intocasper-astro:mainfrom
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added tut_intro model file, also made changes to the intro tutorial document#71Gmotion94 wants to merge 2 commits intocasper-astro:mainfrom
Gmotion94 wants to merge 2 commits intocasper-astro:mainfrom