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Add functionality to your microblog.

• Add a password field to the login form. If the user doesn't exist, create a new user and store the password in the User object. If the user does exists, check the password and, if it's wrong, don't let them log in (you can decide the details for yourself).
• Add multi-user support by storing your users in a HashMap<String, User> and putting your ArrayList<Message> inside the User object.
• In the /create-user route, save the username into the session. In the / route, get the username out of the session and subsequently get your User object.
• Show a logout button when the user is logged in. It should invalidate the session and refresh the page so you can log in again with a new user.
• Add a form in messages.html which lets you delete a message by entering its number.
• Add a form in messages.html which lets you edit a message by entering its number and the text you want to replace it with.
• Optional: Make the microblog persist data on the disk by encoding the data as JSON in each POST route, and decoding it when the web app first runs.
• Optional: Make each item have items own delete button next to it, so you can simply click the appropriate button rather than type in a number.