Create base structure for admin dashboard and user management

...1/polish_community/admin/controllers/AdminController.java

..._group_11/polish_community/admin/dao/AdminRepository.java

...up_11/polish_community/admin/dao/AdminRepositoryImpl.java

...ty_group_11/polish_community/admin/models/AdminBoard.java

...ty_group_11/polish_community/admin/models/ManageUser.java

...roup_11/polish_community/admin/services/AdminService.java

..._11/polish_community/admin/services/AdminServiceImpl.java

src/main/resources/schema.sql

src/main/resources/static/css/admin/adminBoardStyles.css

src/main/resources/static/css/admin/userManageStyles.css

src/main/resources/templates/admin/adminBoard.html

src/main/resources/templates/admin/userManage.html