Revert "updated readmes"

This reverts commit 211973fab126c7de75e43201224765fd6092a9ae.
Merge branch 'master' of github.com:HelsinkiHacklab/XMega-boards
oops...

Revert "Revert "updated readmes""

This reverts commit ee428003964d35986cc8aaf2dc729479c3b1fa4f.