카테고리 리스트뷰, post_act에서 키워드,카테고리 표시
Merge branch 'feature/man2' of https://github.com/Ganco/KNU_Market into feature/man2
add 'finish();' to all Activities
Merge branch 'feature/man2' of https://github.com/Ganco/KNU_Market into feature/man4

Conflicts:
	app/src/main/res/layout/activity_post.xml