Use the text prop to set text in editor

[reggie3]

The documentation says that the text prop is used to set the contents of the editor, but the current code expects to find that information in a PlaceHolder prop. This PR fixes the code to match the documentation.

[eneskarpuz]

Hey @reggie3! thanks for your attention. It looks like just a Readme mistake. Text value of editor is setting in onText function with onChangeText prop of TextInput in DragTextEditor.js. Also in that part you mentioned PlaceHolder prop is setting the first value of text state with a condition.Tell me If I'm missing something you said ?

[reggie3]

It sounds like you're saying that if we want to provide text to the DragTextEditor component, then it needs to be provided via the PlaceHolder prop; Is that correct? If not, how should the text be provided?

[eneskarpuz]

Want to provide external text to the component other than text entered on the keyboard? If so. Yes, You can do that with the PlaceHolder prop. The prop name may vary but you should do this for all the PlaceHolder props.

[reggie3]

Okay, that makes sense. If that is the case, then I don't think this PR is necessary.

[eneskarpuz]

@reggie3 If you want, it would be good to update the PlaceHolder prop to a expression that indicates it can get external values in readme and code. I think lib needs it.