Add dependencies and usage

README.md

@@ -8,18 +8,17 @@ It is written in Python and uses Qt for its graphical interface.
 
 ## Dependencies
 
-Labelme requires at least [Python 2.6](http://www.python.org/getit/) and
-has been tested with [PyQt
-4.8](http://www.riverbankcomputing.co.uk/software/pyqt/intro).
+- [PyQt4](http://www.riverbankcomputing.co.uk/software/pyqt/intro)
 
 
 ## Usage
 
-After cloning the code you should first run `make` to generate the
-resource file (a Python module containing all the icons).
 
-You can then start annotating by running `./labelme.py`. For usage
-instructions you can view the screencast tutorial from the `Help` menu.
+```bash
+$ pip install labelme
+
+$ labelme  # Open GUI
+```
 
 At the moment annotations are saved as a [JSON](http://www.json.org/) file.
 The file includes the image itself. In the feature support for XML