[e-users] Chart library

Hello

for those who would be interested in a chart library, i've begun one,
located here:

https://git.enlightenment.org/vtorri/echart

for now:
 * line chart (straight lines of smoothed)
 * bar chart (horizontal and vertical)
 * pie chart

It uses exclusively the EFL (and its vector library), no additional dependency.

Feel free to add features or report bugs in issues and patches as PR

Vincent