Update README.md
Icon.py creates sdide.desktop launcher to desktop folder.

Author:    bluesunday <jussi.konttinen@hotmail.com>

On branch master
Your branch is up-to-date with 'origin/master'.

Changes to be committed:
modified:   README.md
new file:   icon.py
Merge branch 'master' of https://github.com/bluesunday/sdide