Added user roles

mozen/src/main/java/mozen/auth/JwtAuthenticationFilter.java

mozen/src/main/java/mozen/auth/JwtUserDetailsService.java

mozen/src/main/java/mozen/business/UserManager.java

mozen/src/main/java/mozen/model/Role.java

mozen/src/main/java/mozen/model/User.java

mozen/src/main/java/mozen/utils/DatabaseFiller.java