Add artchitect document.

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Update database part.

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Add style document.

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Update the requirement part of design document

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Update ui part of design document.

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Update existing pages, add footer and update header.

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Add task page.

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Add task page part.

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Add group page.

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Update group page.

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Add auth page.

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Add auth part of design document.

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Add attribute page.

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Add attribute part of design document.

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Merge branch 'doc'
Merge branch 'pre'