Merge pull request #15 from KimMinJeong/KMJ

add modal
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Merge branch 'master' of github.com:KimMinJeong/Collabo into board_main_contents

Conflicts:
	Board/Board_main.py
	Board/templates/contents.html
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Merge pull request #16 from KimMinJeong/board_main_contents

Board main contents
0127 add modal