Add the Licesne badge

[Yasset Perez-Riverol]

We need to add a license badge to each box. To get the badge we will implement a system that get the license from the Tool, color will be a Map (following here) and this service will give you the badge (example)

The color code is the following:

Apache = brightgreen
MIT       = green 
GPL      = blue
BSD      = yellow
CC        = blueviolet
Artistic   = important 

For all the other types we should use the color lightgrey

[Yasset Perez-Riverol]

The license has been added.

[Yasset Perez-Riverol]

This has been implemented.