Update structure code to start dev
Implement command: "add"
Update DBStorage (store linked list)
Add FileStorage (for XML files) use dom4j. Implemented basic IO methods. Update .gitignore for library and test files
Finish FileStorage for add floating tasks (writing and reading XML files)
Merge commit Linh's branch into vani's_branch

Conflicts:
	.classpath
	src/todologApp/CommandAdd.java
	src/todologApp/Controller.java
	src/todologApp/DBStorage.java
	src/todologApp/Storage.java
	src/todologApp/Task.java