Features list into README

README.md

@@ -9,6 +9,18 @@ Please use the [issue tracker](https://github.com/ajjackson/ascii-phonons/issues
 
 ![](images/comof_phonon.gif)
 
+## Features
+
+* Import atomic positions, unit cell and phonon modes from `.ascii` files
+* Use open-source graphics package Blender to render images; the end-user is not required to interact with the Blender GUI unless they want to
+* Create static or animated images showing the unit cell bounding box, atomic positions and mass-weighted eigenvectors
+* Use ImageMagick to export .gif files for use in web browser
+* Display arbitrary supercell size defined by three counting numbers. The displayed bounding box may be shifted within this structure.
+* Animated images include mass-weighted movements of atoms, which include the phase shift in different unit cells
+* Arrows indicating mass-weighted eigenvectors do *not* include phase information
+* An attractive "cartoon-like" visual style with flat colours and outlines
+* Atom colours are assigned from a default or user config file. If undefined, a random colour is selected.
+
 ## Development
 
 The target for input files is the ASCII format used by [v_sim](http://inac.cea.fr/L_Sim/V_Sim/), a useful program and currently one of the only tools available for visualising phonons. These files contain all the information needed to define a crystal sructure and its vibrations. It is presumed that these are generated by [Phonopy](http://phonopy.sourceforge.net/) from *ab initio* electronic structure calculations, and initially this code will only target the features used by Phonopy. Extension to the full ASCII format is of course welcome.