[Feature/PE1-16] Implementation of the welcome page#11

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Sheldonsu28 wants to merge 4 commits intodevelopfrom

feature/PE1-16-welcome-page

Commits on Jun 16, 2021

added resources for welcome page and some implementations (circle, calender, rectangle overlay)
Sheldonsu28
committed

Commits on Jun 18, 2021

welcome page implementation finished
Sheldonsu28
committed

Commits on Jun 24, 2021

Merge branch 'develop' into feature/PE1-16-welcome-page
Sheldonsu28
authored

Commits on Jun 25, 2021

change the image resource to frank's resource and resolve the version conflict
Sheldonsu28
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