Update README.md
added toolbox image
rewrote code for upgrading resos in a portal
Merge pull request #6 from dazz/bugfix/resoUpgradeOrder

rewrote code for upgrading resos in a portal
Update README.md
Create README.md
Update README.md
adapt update and download URL
Merge pull request #7 from thiasB/master

adapt update and download URL
Merge branch 'master' into Potsdam