Make README clearer

[mtangoo]

Hi,
I was looking for a terminal emulator to embed in my wxWidgets based C++ application when I found this repo. Reading from readme things are not clear:

1. Is this a C++ library, Python Library or a standalone app?
2. Supposing it is a library, How can it be integrated with an application (be it a C++ or Python)?
3. What are features provided by this (library?)

Those are crucial missing links. When you get time you can address them on readme or as a comment.
Thank you!