I want do an app,i want it look the same as this one:

I don’t know how to write the word “writing” as the red mark ,and how to add the app icon on
the screen.
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The answer is simple and yet annoying: It is not possible using the standard lock screen. Source of Android's lock screen describes where to find the source code of the default lock screen, and if you look into the source code of LockScreen.java you will find out that this information is hard coded. So basically you will have to wait for a new Android version to support this feature or program your own lock screen, which kind of misses the point. :-/