Create README.md

### VM v2.0 (by Mauricio and team)

 * Initial commit 23/07/2013 by Mauricio Alferez
 
* Supports
  - Attributed feature models
  - metainformation of the main model
  - metainformation of features and attributes
  - Specify configurations of feature values using tables.
  - Constraints using Features and Attributes as operands. 
  - Global functions to compute values based on features and attributes.
  - Quantification when expressing constraints and global functions.