Create an address book application using JavaScript (plus HTML and CSS).

(Use plain JavaScript, no third party libraries!)

The **required functionality** is the following:

* Entries

- Entries have the following fields: name, telephone number, email

- Individual entries must be represented as an Entry object

- The contact list must be represented as an array of Entry objects

- The application must be shipped with some sample initial data (meaning, with a non-empty address book)

* Display a list of entries

- Emails should be clickable links that open in the mail client

* Add a search field to filter the list

- Only those entries are displayed that contain the searched string as part of the name, telephone, or email

- Matching is case-insensitive

* The user can delete existing entries

- Ask for a confirmation before deleting the entry

* The user can add new entries

- Perform input check

- The name field must never be empty

- Either tel or email has to be filled in

- Email has to be a valid email

- Tel may contain only numbers and + - ( ) and space

In addition, you need to implement **at least one extra feature** (of your choosing) from the following options:

* Allow the list to be sorted based on name, telephone, or email. The sorting criteria can be chosen from a select list.

* Add a settings panel that is hidden by default and is shown by clicking a button or link. The user can customize the appearance of the list, for example, change the font family and size for the different fields (name, tel, email), from predefined lists.

* Allow for existing entries to be modified.

Add entry Name: Tel: Email: Add Don John 12-322-622 don.john@ymail.com Elizabeth Westland 66-112-312 e47wl@outlook.com John Smith 12-345-678 john.smith@gmail.com Kevin Magnussen +31 997-11-21 kevinrulez@noemail.com