fixed project README.md

README.md

 # An example of multi package project
 
 This repo contains 3 packages:
+
 * heatdiff-env: this package is used as a base-package for the two others it contains the shared environment
 * heatdiff: this package is the one solving the 1d-heatdiff equation and producing data
 * heatdiff-analysis: this package contains the analysis of the results