Add TITLE bottom in rich text editor

[alrcatraz]

What would you like to do?

Add some bottoms to create title format in text.

Why would you like to do it?

When using markdown to create formatted text, we can create a series of title text, but it can not achieve in rich text editor.

How would you like to achieve it?

A series of bottom, or a select box to choose which level of title we want a line of text be