Add clicked handler for search rectangle.

How reset the status of the search UI element? The onClicked() handler only
handles clicks directed at that specific element. I want to reset it when the
user clicks elsewhere.

Appears as if qmls UI's uses the states mechanism for handling input. Looks
neat. Will try that later.
qmlexperiements: Add grid example.
Add Note.qml

Next step is figuring out how to adjust the size of the parent component to the
inner component and how to enable scrolling.
Adjust some margin properties
Extract SearchBar component.
Extract NotePanel.qml
qmlexperiments: Create obj dynamically.

The qml documentation says that an app usually uses the C++ enviroment for
creating objects. I have a hard time understanding what qml object creation
means: The parent needs to be an object createObject must be called through
an object. I had expected that we could call it throug a type, like a
constructor. Confusing! Is this related to the prototype-based design of
javascript?
SearchBar: Use TextInput instead of TextEdit.

We only need a single line of input.
README: Add a few todos.