7-1 first methods controller

src/main/java/com/example/livecodingjavaspring/App.java

src/main/java/com/example/livecodingjavaspring/Cli.java

src/main/java/com/example/livecodingjavaspring/User.java

src/main/java/com/example/livecodingjavaspring/UserDao.java

...m/example/livecodingjavaspring/UserLibraryController.java